Stones with enchanted souls of terrible monsters and are used to summon them on special altars.

There are 3 places on the map where they can be found - each resp once a day at SS.
(in the magic shop in Carlin, the king's cellars in Thais and the center of magic towers in Edron).
Soul Jail stone - can be obtained from daily reward chest too.

To summon the boss, stand on the tile and throw the stone into the fire.

Easy Boss	Medium Boss	Hard Boss
Thais - bless temple in south of city	Carlin - in sewers near slimes on west town part	Cormaya - near steam ship