"The red crystal of Hydeni contains the power to stir up fiery energy. Fire monsters will flare stronger with the help of this crystal."
The Fire Sanctuary is a building which can only be bought in the Glory Shop. It increases the Attack Power of Fire monsters owned by the player by 2% per building level. The bonus from this building is applicable in all areas.
The bonus ATK is calculated from the base stat of the monster and is additive with bonuses from runes, leader skills, and glory buildings.