Infusion

Weapons and shields can be enhanced through infusion, which adds elemental damage and/or modifies the attribute bonuses.

Infusions are conducted by Blacksmith Andre in the Firelink Shrine.

List of Coals

In order to conduct certain infusions, Andre must be given the correct coal to work with.
Four coals are required to unlock all infusions:

Key Item	Usage	Availability
Farron Coal	Unlocks Infusion with Heavy Gems, Sharp Gems and Poison Gems.	On the Road of Sacrifices, in the building right above the Farron Keep Bonfire, guarded by a Black Knight.
Giant's Coal	Unlocks Infusion with Lightning Gems, Simple Gems and Chaos Gems.	In Anor Londo, on the corpse of the Giant Blacksmith.
Profaned Coal	Unlocks Infusion with Dark Gems, Blood Gems and Hollow Gems.	Inside the Irithyll Dungeon, in a cell on the lower levels, guarded by several Wretches.
Sage's Coal	Unlocks Infusion with Crystal Gems, Blessed Gems and Deep Gems.	In Farron Keep, inside a small structure guarded by a Darkwraith.

List of Gems

Weapons can be infused with gems, each of which has a different effect:

Gem	Effect
Heavy Gem	Increases the Str. Scaling, and reduces the base damage and Dex. Scaling. Requires the Farron Coal to Infuse.
Sharp Gem	Increases the Dex. Scaling, and reduces the base damage and Str. Scaling. Requires the Farron Coal to Infuse.
Refined Gem	Balances the Str. and Dex. scaling and reduces the base damage.
Raw Gem	Increases base damage and removes Str. and Dex. Scaling.
Crystal Gem	Adds Magic damage and Int. scaling, and reduces the base damage, Str. and Dex. scaling.
Simple Gem	Adds Magic damage to a weapon, as well as an FP restoring effect.
Fire Gem	Infuses a weapon with Fire damage, but removes all attribute scaling.
Chaos Gem	Adds Fire damage and Int./Fth. Scaling, and reduces base damage and Str. and Dex. Scaling. Cannot be Buffed. Requires the Giant's Coal to Infuse.
Lightning Gem	Adds Lightning damage and Faith scaling.
Blessed Gem	Adds Fth. Scaling and HP Regen, but reduces the base damage and Str. and Dex. Scaling. Cannot be Buffed. Effective against Undead. Requires the Sage's Coal to Infuse.
Deep Gem	Adds Dark damage and increases the base damage, but removes all attribute scaling.
Dark Gem	Can be used to infuse weapons, adding Dark damage, as well as Int. and Fth. scaling.
Blood Gem	Adds Bleed, but reduces the base damage and Str. and Dex. Scaling. Cannot be Buffed. Requires the Profaned Coal to Infuse.
Poison Gem	Adds a Poison effect, but reduces the base damage and attribute bonuses.
Hollow Gem	Adds Luck scaling; Reduces the base damage, and Str. and Dex. scaling.
Shriving Stone	Removes infusions from weapons.

If an infusion is not to your taste, you can remove the infusion by using a Shriving Stone on it at Blacksmith Andre.

Limitations

The following categories cannot be infused:

• Bows
• Greatbows
• Crossbows
• Chimes
• Talismans
• Staves
• Pyromancy Flames
• Any weapon with the Unique or Boss reinforcement path

Buffs and Infusion

Weapons with certain infusions cannot be buffed, i.e. affected by spells like Magic Weapon or by consumables like Gold Pine Resin.

The following infusions work with buffs:

• Heavy
• Sharp
• Raw
• Refined
• Hollow

The following infusions do NOT work with buffs:

• Poison
• Crystal
• Blessed
• Deep
• Dark
• Bleed
• Lightning
• Simple
• Chaos
• Fire