"In the deepest sandpits of Tamor Desert, a pure crystal of sand grows every thousand years. Carved from this crystal, the guardstone has a miraculous ability to absorb evil energy."
The Guardstone is a building which can only be bought in the Glory Shop. It increases the base Defense stat of every monster owned by the player, in any battle by 2% per building level. The bonus from this building is applicable in all areas.
The bonus DEF is calculated from the base stat of the monster and is additive with bonuses from runes, leader skills, and glory buildings.