Thread:Hwo-optc/@comment-28061192-20170903155042/@comment-32131233-20170917020850

Zephyr is raid boss, so same mechanic as other raid boss, you can only skill up them using their copies.

He come back now and then, so if you can farm them, I recommend to farm him and spend gems for stamina.

Both Gecko Moria have their niche, so really up to you from my perspective.