- Cathedral of the Deep
- Grand Archives
- On a corpse found along the rafters after dropping down from Gertrude's bird cage.
- One can be obtained once per playthrough by trading the Moaning Shield with the Nestling.
- Dropped by:
Infuses weapons with Blessed damage, granting Faith scaling but reducing Strength and Dexterity scaling, along with reducing base damage considerably. Additionally, the player gains health regeneration of 3 HP every 4 seconds whilst the infused weapon is drawn. Every level of upgrade decreases the tick interval by 0.25 seconds, down to a rate of 3 HP per 1.5 seconds at +10 upgrade level.
If a weapon with innate, non-scaling lightning damage is infused, the gem will also add some Faith scaling to the lightning damage.
Weapons with the Blessed infusion will deal 20% bonus damage to undead creatures (e.g., most enemies within Catacombs of Carthus. Killing an enemy with a Blessed weapon also prevents them from reviving.
- The Sage's Coal is required in order to use Blessed Gems for infusion.