Fusion allows heroes to continue equipping more powerful items as they level, without losing the stats of their current items. Fusing also increases a hero's overall rating and health.
At specific fusion levels (each color change up to purple) new skills are unlocked.
An avatar picture of the hero is unlocked when you fuse it to purple.
Some heroes can learn an additional skill after being fused to orange and completing their Awakening quests.
|Green border and corners||Green + 1|
|Blue border and corners||Blue + 1|
|Blue border, purple gems||Blue + 2|
|Purple border and corners||Purple + 1|
|Purple border, red gems||Purple + 2|
|Purple border, orange gems||Purple + 3|
|Purple border, orange corners||Purple + 4|
|Orange border and corners||Orange + 1|
|Orange border, red gems||Orange + 2|