"No, really, what build do you take to an eidolon [Hunt] oh grimmed sage?"

Haha, telling you would spoil the surprise little one (;

A more "serious" [Octavia] for eidolons. We can meme about strength all day long, but what about actual ~powers~? Take advantage of the secondary weakness of eidolons with a So Very Very Cold Vectis Prime, and add that beautiful radiation damage when you need it- granted you'll have it for 50 whole seconds, so no [Rush], really. Take your time. You won't need it!

Alternative to [Rolling Guard], run [Narrow Minded] and swap Vigilante Fursuit for something like [Power Drift]. VP's inclusion here assumes you're statting a companion up with the rest of the Vigilante set to enhance those big crits even biggier.

[Smite Infusion] cAn'T gO iN tHe eXiLuS sLoT