Hero evolution stones
Fire Evolution Stone Rift
Build a reliable stock of Fire Evolution Stones for a Fire hero you actively use.
Adventure > Rift > Evolution Stone Dungeon; select the Fire element.
Repeat the Fire stage or sweep with available Coffee while the chosen hero still needs Fire stones. Rift farming is repeatable; the hero’s evolution milestones are finite.
Stop when the target hero reaches the evolution milestone you planned, or switch to another element or resource dungeon if a different material is now the progression bottleneck.
Open a guide to find other locations and see what the item is used for.
Build a reliable stock of Fire Evolution Stones for a Fire hero you actively use.