Soulstones are stones that embodies fragments of a familiar's soul used in a ritual to call them back from the underworld. They were first introduced in the Arcane Glaciers Tower.
A stone surrounded by a mystical blue aura.
These can be obtained by capturing the featured familiars in the "Sanctum of the Fallen" in Special Dungeon Events.
Collect a total of 15 to redeem for familiars in the Soulwell.