Sword Saint Class
 
Base HP: 8
HP per level: 5 + Constitution Modifier
Primary Ability & Spellcasting Ability: Intelligence
Learn Spells from Scrolls: No
Need to Prepare Spells: No
Spell Caster level: 0.75 * Class Level  (between vanilla half casters—such as Paladin, and full casters—such as wizard)
Saving Roll Proficiency: Intelligence & Dexterity
Armour Proficiency: Light & Medium Armour
Weapon Proficiency: All Melee Weapons
Dialogue Tags: Fighter & Wizard

Sword Saints' spell list is similar to Wizard, but does not include Conjuration, Divination, Enchantment or Illusion School.
 
 
Arcane Arts: Arcane Arts are key passives that buildup features of Sword Saint. There're currently three levels of Arcane Arts.

At level 1 and 3, you select a lv1 Arcane Art
At level 5 and 7 you select a lv1~2 Arcane Art
At level 9 and 11 you select a lv1~3 Arcane Art

Arcane Arts list is given at the bottom
 
Level Up Map:
 
Level 1:
Learn Cantrip Green Flame Blade (Only if you have 5e spells installed)
Learn one Cantrip from Sword Saint Cantrips

Select a Level 1 Arcane Art
 
Level 2:
Gain two level 1 Spell Slots
Learn one Level 1 Spell from Sword Saint Spells.

Unlock Arcane Precision:
You can expend a level 1~3 Spell Slot to add your Intelligence Modifier to the Attack Rolls of your weapons for one turn. You can use this as a reaction when you are about to miss a weapon attack

Level 3:
Gain one level 1 Spell Slot
Learn one Level 1 Spell from Sword Saint Spells.

Select a Level 1 Arcane Art
 
Level 4:
Select a Feat

Gain two level 2 Spell Slots and one level 1 Spell Slot
Learn one Level 1~2 Spell from Sword Saint Spells

Unlock Instant Strike:
Your first weapon attack each turn does not require an action, but its Attack Roll is reduced by 4.
 
Level 5:
Select a Level 1~2 Arcane Art

Unlock Dimension Blade:
Expend a lv1 spell slot, make a melee attack without Attack Roll; instead, the target makes a Dexterity Saving Throw to decide whether they can dodge the attack, with a difficulty of your Spell Save DC +5. On a successful hit, it also deals additional 1d6 Force damage.
Upcast: Deal additional 1d6 Force damage for each level
 
Level 6:
Gain one level 2 Spell Slot

Learn one Level 1~2 Spell from Sword Saint Spell

Unlock Elemental Blade (Fire, Cold, Lightning):
Your weapon attacks deal additional [Intelligence Modifier] damage of the toggled type of element

 
Level 7:
Gain two level 3 Spell Slots
Learn one Level 1~3 Spell from Sword Saint Spells

Select a Level 1~2 Arcane Art

Unlock Thunder Smite:
Expend a level 3 Spell Slot, Perform a melee weapon attack with additional 2d4 Thunder damage. Enemies who fail a Constitution Saving Throw
will be Stunned for a turn, for a turn, and will need to pass another Wisdom Saving Throw or they will also be Paralyzed.
Upcast: deal additional 1d4 Thunder damage per level.
 
Level 8:
Select a Feat

Gain one level 3 Spell Slot
Learn one Level 1~3 Spell from Sword Saint Spells

Unlock Improved Lightning Strike:
You can make two attacks each turn without expending an action, but the Attack Roll for each is reduced by 7 and 4, respectively.
 
Level 9:
Select a Level 1~3 Arcane Art

Level 10:
Gain one level 4 Spell Slot
Learn one Level 1~4 Spell from Sword Saint Spells

Unlock Disillusion Smite:
Expend a level 4 Spell Slot, Perform a melee weapon attack with additional 4d8 psychic damage. Enemies who fail a Wisdom saving throw will have
Disadvantage on all Saving Throws and Attack Rolls for two turns.
Upcast: deal additional 1d8 psychic damage per level.

New Passive Feature: Improved Arcane Precision
You will automatically acquire Arcane Precision for one turn when you cast any non-cantrip spell. When you have arcane precision, your damage will ignore slashing, bludgeoning, piercing, fire, cold, lightning and thunder Resistance.

 
Level 11:
Gain one level 4 Spell Slot
Learn one Level 1~4 Spell from Sword Saint Spells

Select a Level 1~3 Arcane Art
 
Level 12:
Select a Feat

Gain one level 4 Spell Slot and one level 5 Spell Slot
Learn one Level 1~5 Spell from Sword Saint Spells

Unlock Greater Lightning Strike:
You can make three attacks each turn without expending an action, but the Attack Roll for each is reduced by 9, 7 and 4, respectively.

 
Levels after lv12 are dummy levels with only spell slot growth.
 
 
Arcane Art List:
Level 1:

Swift as Wind: Your Movement Speed increase by 3m; add your Intelligence Modifier to your Stealth and Initiative checks.

Perfect Strike: When you are at maximum hit points, you gain a +2 bonus to weapon Attack Rolls, and add your Proficiency Bonus to weapon damage.

Arcane Guidance: Whenever affected by a friendly non-cantrip spell, you gain a stackable +1 bonus to your weapon Attack Rolls; as long as you have arcane guidance, your weapon attacks deal additional 1d8 Force damage.

Arcane Weapon: You can infuse arcane energy into a weapon, turning it into a magic weapon, and the ability score used for the attack and damage rolls becomes Intelligence. Only one weapon can be infused at a time.

Prescient Defense: When wearing no armor or only light armor, you acquire an additional Reaction and add Intelligence Modifier to your Armour Class.

Level 2:

Spell Parry: If an enemy targets you or is within 2.5m of you when casting a spell, you can expend a Reaction to parry it, as if casting a level 3 Counter Spell. A successful parry will possibly knock the enemy Prone.

Spell Combat: You learn Fire Bolt. Once per turn, after you make a weapon attack, you can cast a non-smite spell with your Bonus Action instead of an Action.

Extraordinary Knowledge: Your Intelligence increases by 3.

Spell Strike: You learn Thunderwave, Scorching Ray and Lightning Bolt. When you cast a non-cantrip, non-smite spell that deals instant damage:
if it contains an attack roll, you apply one stack of Synergistic Strike to the target on each hit;
if it is a save-based spell and successfully penetrates the target's saving throw, it will incur additional damage as if your main hand melee weapon had hit. (Note: this does not include your weapon's damage die and the damage provided by your ability modifier that the weapon uses)

Synergistic Strike: Armour class reduce by 1.Additionally, each stack will incur extra 1 Force damage whenever the creature is damaged by sword saint (with a maximum of 3 Force damage). All stacks will be cleared at the start of each turn.

Level 3:

Abundant Casting: Your number of lv1, lv2, lv3 and lv4 Spell Slots increases by 1.
 
Elemental Conductor: Whenever you deal fire, cold, or lightning damage, you increase it by 2.

Flurry Chop: Once per turn, you can expend a reaction to make a melee weapon attack, if this attack kills a creature, your reactions will be replenished.
 
Storm Combo: Whenever your weapon attack successfully hits, your subsequent weapon attacks during the same turn deal additional 1d8 Thunder damage. This effect can stack up to 2 times.