Fire Knight's Seal is a Sacred Seal in Elden Ring. It is a brand new Sacred Seal in the Shadow of the Erdtree DLC. The Fire Knight's Seal scales primarily with Strength and Faith and is a good Weapon for Builds centered around the new Messmer Fire Incantations.
The Fire Knight's Seal weapon can be found at the following location: Shadow Keep: In the area with the giant Queen Marika statue, it is behind the statue. You have to use the lever to lower the water level. [Elden Ring Shadow of the Erdtree Interactive Map] [Video Location]
Weapon Skill: No Skill
This weapon cannot be infused with Ashes of War
Fire Knight's Seal can be upgraded by using Smithing Stones
Boosts Messmer Fire Incantations by 15%
Incant Scaling:
60 Faith: 259
70 Faith: 296
80 Faith: 333
Other notes and player tips go here

Attack
Guard
Scaling
Requires
Skills: No Skill
Damage Type: Strike
FP Cost: FP -
Weight: Wgt. 1.5
"Sacred seal of the Fire Knights, who answer directly to Messmer the Impaler. Enhances fire incantations of Messmer. The emblem of Messmer's army depicts a golden ring and the fire of his sacred seal. "