Build soul & fuse

It didn't take long before the lava golem finally collapsed, its massive body falling into the lava pool, splashing hot liquid in all directions. From the remains of its body, a round orb made of lava stone floated up.

(Magma Fury Core - Soul B) 

When used, this item boosts the user's attack power, channeling the lava golem's rage to unleash devastating fire-based attacks.

- Hellwave: Increases the user's attack power by 200% for 10 seconds. During this time, each attack has a chance to burn the enemy, inflicting fire damage over time. 

- Cooldown: 3 minutes 

"Ah... so the dropped item matches the soul guardian of the Soul Gate," Lein murmured thoughtfully.