Combine Method:Sussur Forge (Warning, will sometimes no longer work after you complete the quest by using a Dagger, Greatsword, or Sickle.)
Product:Sussur Handcrossbow
Ingredient:Hand Crossbow

Product:Sussur Longbow (Requires Sussur Longbow mod)
Ingredient:Longbow

Combine Method:Iron Anvil

Note that the differences between the Spear and the Glaive are purely cosmetic, aside from respectively having Piercing and Slashing as their primary damage type, and the Glaive being slightly heavier.

Product:Selûne's Spear of Moonlit Night
Ingredient:Selûne's Glaive of Moonlit Night
Ingredient: Glaive/Vision of the Absolute

Product:Selûne's Glaive of Moonlit Night
Ingredient:Selûne's Spear of Moonlit Night
Ingredient:Spear/Sorrow


Combine Method:Adamantine Anvil

Product:Adamantine Robe
Ingredient:Sussur Tree Flower
Ingredient:Mithral Ore
Ingredient:Sussur Tree Flower

Product:Mighty Graceful Adamantine Battlesuit
Ingredient:Adamantine Robe
Ingredient:Graceful Cloth
Ingredient:Mighty Cloth

Product:Selûne's Spear of Moonlit Night
Ingredient:Selûne's Spear of Night
Ingredient:Moonlight Glaive
Ingredient: Vision of the Absolute

Product:Selûne's Glaive of Moonlit Night
Ingredient:Selûne's Spear of Night
Ingredient:Moonlight Glaive
Ingredient:Sorrow

Product:Abomination Slayer
Ingredient:Emperor's Sword
Ingredient:Giantslayer
Ingredient:Black Diamond

Combine Method:Platinum Anvil

Product:Mighty Graceful Adamantine Soul-Rejuvenating Battlesuit
Ingredient:Adamantine Scale Mail
Ingredient:Mighty Graceful Adamantine Battlesuit
Ingredient:Vest of Soul Rejuvenation
Ingredient:Mithral Ore

Product:Primal Greatsword of Calamity
Ingredient:Trident of Calamity
Ingredient:Sword of Chaos
Ingredient:Murderous Cut
Ingredient:Black Diamond

Product:Stilling Bitter Crimson Bloodthirst
Ingredient:Bloodthirst
Ingredient:Crimson Mischief
Ingredient:Dolor Amarus
Ingredient:Stillmaker
Combine Method:Smith Tools

Product:Sussur Hand Crossbow
Ingredient:Sussur Bark
Ingredient:Hand Crossbow

Product:Sussur Hand Crossbow
Ingredient:Sussur Tree Flower
Ingredient:Hand Crossbow

Product:Sussur Dagger
Ingredient:Sussur Bark
Ingredient:Dagger

Product:Sussur Greatsword
Ingredient:Sussur Bark
Ingredient:Greatsword

Product:Sussur Longbow
Ingredient:Sussur Bark
Ingredient:Longbow

Product:Sussur Sickle
Ingredient:Sussur Bark
Ingredient:Sickle

Product:Watcher Hand Crossbow (Small)
Ingredient:Mithral Ore
Ingredient:Sussur Handcrossbow

Product:Watcher Hand Crossbow (Medium)
Ingredient:Sussur Bark
Ingredient:Watcher Hand Crossbow (Small)

Product:Watcher Heavy Crossbow
Ingredient:Sussur Bark
Ingredient:Watcher Hand Crossbow (Medium)

Combine Method:Advanced Smiths Tools

Product:Watcher Hand Crossbow (Medium)
Ingredient:Mithral Ore
Ingredient:Sussur Bark
Ingredient:Sussur Handcrossbow

Product:Wavemother Infernal Obsidian Robe
Ingredient:Infernal Obsidian Robe
Ingredient:Wavemother's Robe
Ingredient:Infernal Plate/Alloy

Product:Potent Robe of the Weave
Ingredient:Robe of the Weave
Ingredient:Potent Robe
Ingredient:Elixir of Supreme Arcane Cultivation

Product:Bracers of Harmony
Ingredient:Braindrain Gloves
Ingredient:Dark Justiciar Gauntlets (either rarity)
Ingredient:Bracers of Defence or Gloves of Uninhibited Kushigo

Product:Robe of Supreme Defences
Ingredient:Bone
Ingredient:Ball
Ingredient:Mithral Ore

Combine Method:Expert Smith's Tools

Product:Watcher Heavy Crossbow
Ingredient:Mithral Ore
Ingredient:Sussur Handcrossbow
Ingredient:Sussur Bark
Ingredient:Sussur Bark

Product:Supreme Adamantspike Garb
Ingredient:Bonespike Garb
Ingredient:Robe of Supreme Defences
Ingredient:Mithral Ore
Ingredient:Bone

Product:Infernal Obsidian Robe
Ingredient:Infernal Robe
Ingredient:Obsidian Laced Robe
Ingredient:Infernal Plate/Alloy
Ingredient:Bloodguzzler Garb

Combine Method:Jeweler's Tools

Product:Spear of the Absolute
Ingredient:Spear/Spear +1
Ingredient:Cerebrospinal Fluid Extract

Product:Sorrow
Ingredient:Glaive/Glaive +1
Ingredient:Ashes of Worg Fang

Product:Callous Coruscation Ring
Ingredient:Callous Glow Ring
Ingredient:Coruscation Ring

Combine Method:Advanced Jeweler's Tools

Product:Staff of Harmony
Ingredient:Cacophony
Ingredient:Incandescent Staff
Ingredient:Mourning Frost

Product:Tymora-Blessed Blood of Lathander
Ingredient:Twist of Fortune
Ingredient:Blood of Lathander
Ingredient:Mithral Ore

Product:Trident of Harmony
Ingredient:Staff of Harmony
Ingredient:Nyrulna
Ingredient:Mithral Ore

Product:Umbrasyl's Caustic Folly
Ingredient:Caustic Band
Ingredient:Umbrasyl's Folly (Requires Rings Expanded)
Ingredient:Onyx

Combine Method:Expert Jeweler's Tools

Product:Radiant Tymora-Blessed Blood of Lathander
Ingredient:Tymora-Blessed Blood of Lathander
Ingredient:Infernal Mace
Ingredient:The Sacred Star
Ingredient:Infernal Plate/Alloy/Metal

Product:Trident of Calamity
Ingredient:Trident
Ingredient:Ruby
Ingredient:Sapphire
Ingredient:Jade (No Emeralds in BG3, so Jade Orb it is)

Product:Spacetime Crown
Ingredient:Warped Headband of Intellect/Hood of the Weave
Ingredient:Diamond
Ingredient:Pearl
Ingredient:Infernal Plate/Alloy/Metal

Product:Ring of General Utility
Ingredient:Necromancer's Necrophone
Ingredient:Ring of Levitation
Ingredient:Ring of the Mind Reader
Ingredient:Tree Hugger's Embrace
Combine Method: Cooking Pan
Product:Thong of Zoomies
Ingredient:Potion of Speed 
Ingredient:Potion of Vitality 
Ingredient:Potion of Superior Healing

Rings Expanded Rings:

Note that some of the ingredients don't quite make sense, as I'm working with what the game has and didn't want to make arbitrary rings too hard to obtain...

Combine Method: Jeweler's Tools

Product:Stat Buff Ring:
Ingredient: Bronze/Silver/Gold Bar (for Minor/Greater/Superior)
Ingredient: Potion Of Hill Giant Strength/Potion of Speed/Elixir of Heroism/Elixir of Arcane Cultivation/Elixir of Vigilance/Diluted Oil of Sharpness/Potion of Angelic Reprieve (for Strength/Dexterity/Constitution/Intelligence/Wisdom/Charisma/Luck (gives Lucky ability plus charges dependent on rarity of ring))

Product:Greater Buff Ring
Ingredient: 2 Minor Rings of the same type

Product:Superior Buff Ring
Ingredient: Greater ring
Ingredient: Minor or Greater ring of the same type
Product:Ring of Focus
Ingredient: Elixir of Peerless Focus
Ingredient: Silver Bar
Product:Ring of Levitation
Ingredient: Potion of Feather Fall
Ingredient: Silver Bar
Product:Tree Hugger's Embrace
Ingredient: Potion of Animal Speaking
Ingredient: Bronze Bar
Product:Ring of Concentrated Radiance
Ingredient: Hearthlight Bomb
Ingredient: Bronze Bar
Product:Necromancer's Necrophone
Ingredient: Scroll of Speak with Dead
Ingredient: Bronze Bar
Product:Ring of the Mind Reader
Ingredient: Potion of Mind Reading
Ingredient: Bronze Bar
Product:Arcane Trickster's Lockpick
Ingredient: Scroll of Knock
Ingredient: Bronze Bar
Product:Ring of Focus
Ingredient: Elixir of Peerless Focus
Ingredient: Silver Bar
Combine Method: Advanced Jeweler's Tools

Product:Berserker's Ring
Ingredient: Elixir of Bloodlust
Ingredient: Gold Bar
Ingredient: Gold Bar
Product:Umbrasyl's Folly
Ingredient: Acid Vial
Ingredient: Gold Bar
Ingredient: Gold Bar
Product:Vorugal's Hunt
Ingredient: Oil of Freezing
Ingredient: Gold Bar
Ingredient: Gold Bar
Product:Thordak's Pride
Ingredient: Alchemist's Fire
Ingredient: Gold Bar
Ingredient: Gold Bar
Product:Seymordius' Knowledge
Ingredient: Wizardsbane Oil
Ingredient: Gold Bar
Ingredient: Gold Bar
Product:Brimscythe's Corruption
Ingredient: Wyvern Toxin
Ingredient: Gold Bar
Ingredient: Gold Bar
Product:Vecna's Ambitions
Ingredient: Oil of Bane
Ingredient: Gold Bar
Ingredient: Gold Bar
Product:Raishan's Schemes
Ingredient: Basic Poison
Ingredient: Gold Bar
Ingredient: Gold Bar
Product:Elder Brain's Influence
Ingredient: Purple Worm Toxin
Ingredient: Gold Bar
Ingredient: Gold Bar
Product:Celestia's Radiance
Ingredient: Holy Water
Ingredient: Gold Bar
Ingredient: Gold Bar
Product:Booming Ring
Ingredient: Smokepowder Bomb
Ingredient: Gold Bar
Ingredient: Gold Bar