So, our party with an [Unchained Summoner][1] recently had his Eidolon hit by a [Wight][2]. How does this work with regard to the Energy Drain?

Does the Eidolon get a negative level? How does that interact with the various curing and healing rules?


  [1]: http://www.d20pfsrd.com/classes/unchained-classes/summoner-unchained#TOC-Eidolon
  [2]: http://www.d20pfsrd.com/bestiary/rules-for-monsters/universal-monster-rules#TOC-Energy-Drain-Su-