This mod isnt' supported anymore, use this one instead.


This mod wouldn't be possible without marvellous Spell Tomes DLC.
Unfortunately it's incompatible with the abovementioned mod, and probably won't be compatible with any mod modifying signs script files, unless merged manually without script merger, but do that at your own risk.

The mod brings in new magic items that modify/replace signs abilities when equipped in quick and/or trophy slots (except for the The Sword Ring and Magical Doll). They can be bought from ofieri and novigradian merchants (the ofieri Runewright sells more items when his work station is upgraded) - see the map in the comments section, obtained after completing certain main and side quests (optional file), or by using the console command:
witchermage
List of quests and rewards
Each of the items has unique descriptions to connect them with the game lore.
Some items are trophies and other are quickslot items, so they can be combined, giving different effects to signs. In order to make spells work, place quickslot items in your quick slot (where the torch is) and simply choose one, like you choose bomb or crossbow, and trophy items in your Roach trophy slot, then use corresponding sign; to use spells which modifies the alternate cast you need the proper sign skill equipped in the skill tree. If you need to use standard vanilla sign's effect, just choose torch, bomb or crossbow, and unequip a tome from the trophy slot.

If you have for example Manuscript of Clear Horizon in the trophy slot and Tome of Energy chosen in the quickslot, then the energy effect will be applied; to apply the invisibility spell just choose crossbow or bomb instead of Tome of Energy.

Not all of the functions are described in the ingame descriptions, because there's simply not enough screen space, so be sure to read all the info about spells below.

SPELL ITEMS:

Magical Doll - gives a massive bonus of additional spellpower to all signs if it's equipped.
if you're in a combat and have the Magical Doll in your inventory, you can sheathe your sword and perform various magical light and heavy attacks depending on your currently chosen sign.

• if you don't want that mechanic, drop the Magical Doll from your inventory or put it in your stash
• includes modified No Fistfight's stance mod
• you need to enable the "Manual sword drawing / sheathing" option in your game settings
• includes some new (for Geralt) animations from an ofiery mage
• every attack consumes various amount of stamina
• you can perform the attack only if an enemy is defined, i.e. its health bar should be shown
• you can cancel the attacks by pressing dodge, roll or block keys
• sometimes vampire's and assassin's dodge and roll don't work during these attacks, the standard evades will be applied instead
• pressing the block key creates a short round wave pushing enemies back and slowing them for a short time[/s
• this mechanic doesn't affect fistfight minigames and other mandatory fistfights
  

Tome of Carrying - casts through the standard Quen sign, increases Geralt's encumberance and underwater swimming speed and air.

Manuscript of Clear Horizon - casts through the standard Quen sign, makes Geralt invisible for a short time. Gives instant kill chance, increases chance and damage of critical hits, attack and spell powers upon attacking enemies while you're invisible. After the attack with a sword or a sign you'll loose invisibility. Scales with your Quen sign intensity.
Cannot be cast during fights, the standard quen shield will be applied instead.

Tome of Shelter - replaces the standard Yrden sign and upon placing a circle makes enemies around indifferent towards Geralt for a short time. 

Tome of Meteora - replaces the alternate Axii sign and upon casting summons fire meteors to the target location. Number of meteors, damage and decreasing of damage you receive scale with Axii sign. Cannot be cast in interiors.

Tome of Cold stars - replaces the alternate Axii sign and upon casting summons ice meteors to the target location. Number of meteors, damage and decreasing of damage you receive scale with Axii sign. Cannot be cast in interiors.

Tome of Distance - casts both Yrden versions at the target's position. Increases the range of Whirl, Rend and Aard attacks, if there are no appropriate perks.

Tome of White Sphere - replaces the alternate Axii sign and upon casting creates an ice blast at the target's location. The damage to enemies, the chance and duration of freezing effect and your damage reduction scale with the Axii sign power. The Yrden's alternate version deals frost damage with the chance of freezing depending on the skill of the Magic Trap.

Tome of Fire Entity - replaces the standard Yrden trap and summons fire golem. Replaces the standard Axii sign and casts a line of fire towards a target. Just beware its flames.

Tome of Ice Entity - replaces the standard Yrden trap and summons ice golem. Replaces the standard Axii sign and casts a line of ice towards a target.

Tome of BloodMoon - replaces the standard Yrden sign and creates the Trap of Darkness pulling targets to its position, dealing damage and healing you. If another standard Yrden trap deals damage to a target it heals you. Replaces the alternate Axii sign and drains life from a target when it's near you, healing you for the damage inflicted, and slowing down the target's speed. Modifies the standard Aard, reducing target's stamina and inflicting bleeding. Gives invulnerability during dodge and roll and allows to evade through targets. 

Tome of the Great Swamp -  replaces the standard Yrden trap and inflicts poison damage. Casts at the target's position. The alternate Igni deals additional poison damage. Replaces the standard Axii and creates a poisonball.

Tome of Untouchability - replaces the standard Yrden effect and creates the short repulsive Yrden trap at the the target's position with a chance of knockdown depending on the Yrden sign power. Replaces the standard Axii and has a higher chance to apply knockdown.

Tome of Fire Gnosis - replaces the standard Yrden trap and inflicts fire damage, casts at the target's position. Replaces the standard Axii and creates a fireball. Increases attack power and range for the standard Igni. The alternate Igni deals additional damage. If you have more than 2 adrenaline points your sword will be imbued with the power of fire, dealing additional damage.

Tome of Permafrost - replaces the standard Yrden trap and deals frost damage with a chance of freezing. Replaces the standard Axii and creates an iceball. Unlocks the power of cold for Aard. If you have more than 2 adrenaline points your sword will be imbued with the power of winter, dealing additional damage. While you have and keep adrenaline points higher than 1, replaces the standard Aard and creates frost wave, doesn't consume adrenaline.

Tome "Eye of the Storm" - the alternate version of Aard slows down the time for a short period and gives bonuses to attack and sign powers, stamina regeneration and critical hits. If You have 2 adrenaline points, they will be consumed upon casting the spell and speeds of targets affected by Aard sphere will be drastically decreased, but all the other Aard effects won't apply.

Scroll of Beauty - slows down the time while you're in the Yrden circle (doesn't need to be chosen, just keep it in your quickslot); the yrden range is increased by 50%, but you can put only one trap (needs to be chosen in your quickslot).

Tome of Transference - replaces the standard Axii sign and teleports a target to your position when it's at a distance, or away from you if it's in front of you.

Tome of Assassins Bless - replaces the standard Quen sign and upon casting increases attacking speed and range, attack power, chance and bonus damage of critical hits, gives a chance to inflict poison or bleeding damage, even if there are no such effects on the swords. Replaces the alternate Axii sign and curses a target when it's near you, reducing its speed and attack power. Gives invulnerability during dodge and roll and allows to evade through targets. The alternate Yrden creates tornado, chasing random target.

Tome of Energy - replaces the standard Yrden trap and grants you energy form, you can go through targets, receive less damage and your sword will deal additional shock damage; the yrden range is increased by 50%, but you can put only one trap. Replaces both Axii versions and deals shock damage to an enemy, the standard cast has a chance to affect targets around, the alternate version of Axii charges up the spell increasing the damage and always affects targets around. Replaces the alternate Aard and creates energy blast, if you have 1 adrenaline point. Replaces the standard Quen and gives electrified shield, consuming a part of the damage and returning it to the attacker, reflects arrows back to attackers. Rend deals shock damage to targets around upon succesful strike. If you have more than 2 adrenaline points your sword will be imbued with the lightning power, dealing additional damage. While you have and keep adrenaline points higher than 1, replaces the standard Aard and creates shock wave, doesn't consume adrenaline.

Tome of Quileg Pyromancy - replaces the standard Igni sign and strikes in the 360 radius at the target's position (like the Rotation glyphword effect, can induce burning). Modifies the alternate Igni and creates fire beam dealing additional fire damage. Replaces the alternate Axii sign and opens a portal hitting all enemies around with small meteors (cannot be cast in interiors). Replaces the alternate Aard and creates fire blast with a chance to induce burning, if you have 1 adrenaline point. Replaces the standard Quen and gives fire shield, consuming a part of the damage and returning it to the attacker, reflects arrows back to attackers. The alternate Yrden creates fire vortex, pulling targets to its position.

The Sword Ring - modifies your Rend attacks, depending on the currently chosen sign and its intensity (see a Swordspells video demostration)
if you have more than 1 adrenaline point, your sword will be imbued with the power of the sign, dealing additional damage and effects, depending on the currently chosen sign and its intensity.
Yrden - additional shock damage
Quen  - additional poison damage and ability to heal you for the damage dealt
Igni  - additional fire damage
Axii  - additional frost damage with a chance to inflict freezing effect
Aard  - additional force damage with a chance of knockdown
This item doesn't need to be equipped, just keep it in your inventory and its effect will be applied. If you don't want these effects, drop the item from your inventory or put it in your stash.

When this item is equipped in your trophy slot, if you have more than 90 stamina, it will be consumed and your heavy attacks will be replaced with special effects, depending on your currently chosen sign.
Yrden - creates an yrden wave, which slows down enemies and deals shock damage, depending on your Yrden turret skill (the skill doesn't need to be equipped)
Quen - creates poisonous flames
Igni - shoots a fireball
Axii - creates frost flames
Aard - creates force wave, dealing damage accoding to your Aard damage skill (the skill doesn't need to be equipped)
In order to cancel a sword cast, hold your 'block' key, or double tap 'dodge' or 'roll' keys.

When this item is equipped in your trophy slot, your crossbow bolt will be modified with special effects, depending on your currently chosen sign (see a Crossbow Spells video demonstration).
        Yrden - creates magical explosion
Quen - creates electrical sphere, dealing damage to enemies around
Igni - pierces targets, dealing additional fire damage and causing burning
Axii - slows down targets around
Aard - pierces targets, dealing additional force damage and causing bleeding
Every special shot doesn't consume stamina, but has a 5 seconds cooldown.

Tome of Rock Watcher - replaces the standard Yrden and creates a stone trap keeping a target inside when it's at a distance. Replaces the standard Axii sign and casts a line of stones towards a target. Both Aard versions create stone pillars under each target.

Bracelet of the Grave Warden - replaces the standard Yrden effect and grants you ghost form, you will be able to go through targets and receive less damage while you are in the Yrden circle; the yrden range is increased by 50%, but you can put only one trap. Replaces the standard Axii sign and creates ghost flame dealing fire and poison damage. The standard Quen shield grants you the Weakening Aura, which addles the mind of a randomly-selected opponent within a limited range (The Caparison of Lament effect).

Flower wreath of the Forest Witch - replaces the standard Yrden trap and summons a panther. Replaces the standard Axii sign and creates giant roots, damaging enemies around. Replaces the standard Aard sign and creates small roots under targets restraining them, with a chance to inflict poisoning or bleeding.

Amulet of the Black Fire - replaces the standard Yrden and deals direct damage. Replaces the standard Axii sign and creates magical flame dealing fire and elemental damage. Replaces the standard Quen and gives magical shield, consuming a part of the damage and returning it to the attacker, reflects arrows back to attackers. The alternate Igni creates magical flame.

Ring of Winter Souls - replaces the standard Yrden trap and creates tornado pulling targets to its position, dealing frost damage. Replaces the standard Quen and gives frost shield, consuming a part of the damage and returning it to the attacker, reflects arrows back to attackers. Replaces the alternate Axii and creates frost flame with a chance to inflict freezing effect. Replaces the alternate Aard and creates frost blast, if you have 1 adrenaline point. The alternate Igni creates frost flame.

Grimoire of the Old Gods - replaces the standard Igni sign and strikes in the 360 radius, the alternate Igni deals additional energy damage. The alternate Axii creates energy spear. The alternate Yrden creates lightning.

Manual Spell Aiming - if you have certain spell item equipped and chosen in your quickslot (see the list below), you can press and hold the "Use item" key (Middle Mouse by default) to start the aiming (includes a little slowmo), to cast a spell press the "Abort action" key (Spacebar by default), which is also used to cancel crossbow and bombs actions, you can cycle available spells by pressing the "Draw Steel Sword" key (1 by default), and to cancel the aiming release the "Use item" key. 
In order to cast a spell of a trophy item you need to have any spell item equipped and chosen in your quickslot.
Aiming Spells:

• Tome of Fire Gnosis - fireball and yrden fire trap
• Tome of Permafrost - iceball and yrden frost trap
• Tome of the Great Swamp - poisonball and yrden poison trap
• Amulet of the Black Fire - black fireball (new) and yrden trap
• Tome of Energy - energy stream (new) - you can press the Spacebar to cancel the cast at any time, and energy landmine (new)
• Grimoire of the Old Gods - energy spear and heavy energy projectile (new) 
• Ring of Winter Souls - frost landmine (new) and heavy frost projectile (new)
• Tome of Quileg Pyromancy - fire landmine (new) and fire projectile (new) 
• Tome of Assassins Bless - fast projectiles which can cause poison or bleeding effects (you can fire several of them in a row)(new) and heavy sand projectile (new)
• Tome of BloodMoon - life draining attack (can heal you for the damage dealt, if you're close enough)(new) - you can press the Spacebar to cancel the cast at any time; and a stall - you can place up to four spots which connect to each other forming a fence and not allowing enemies to walk through (active for 29 seconds) (new) 
  

Every landmine is active for 32 seconds.


Almost every aspect of the spells scales with the corresponding signs power and the current Geralt's level to make them better balanced.

If you want to try them out right away, or just too lazy to go shopping you can use the console command:
witchermage
that will give you all spell items immediately

Installation:
Extract 'dlc' and 'mods' folders into your 'Witcher 3' folder, don't use any installation managers. Use Script Merger, if you have other mods. If you're updating from previous version: delete the old version, run Script Merger, install the new one and run Script Merger again. If you get script compilation errors, learn to merge manually.


If you wish to translate the mod, use this tool https://www.nexusmods.com/witcher3/mods/959 - open en.w3strings files in dlc and mods folders, edit them with that tool, save and rename to your language, then you can upload your translation as a standalone mod.

Hope you'll enjoy it as much as I do :)

Special Thanks To:
FictionalFriend - for new custom icons.
Gothamz - for a video showcase.
Tellah9 - for making sword and crossbow spells demonstration video and testing.
Osail - for testing, 'Quest Rewards' addition, support and appreciation.
SorceressJ - for helping people here.