uncommon eidolon evocation summoner 

Cast [>>] somatic, verbal

Area 20-foot radius emanation around your eidolon

Saving Throw basic Reflex

Your eidolon releases a powerful energy attack that deals 5d6 damage of the type you chose when you took the Eidolon's Wrath feat, with a basic Reflex save.

Heightened (+1) The damage increases by 2d6.

Secrets of Magic, page 144.