Talk:Unit Types/@comment-209.153.252.66-20151014012639/@comment-26455864-20151014015109

You level units up by fusing other units into it. Generally, you should only fuse units such as a metal king, metal god, or dark crystal because those types of units are meant for leveling up units, and since they match her element, they will grant her 1.5x exp.

There isn't any element you shouldn't fuse with her, just that these gods/kings/crystals are favored since they are meant for leveling units.