Skeletal life giver merc?Follow

I spotted someone with a "skeletal life giver" mercenary on Vox the other day. I didn't occur to me to ask the player where they got it from until later. Does anyone know where this comes from? It doesn't seem to have shown up in Zam's database yet. Thank you in advance.

I know there's a set of skeleton mercs (probably a claim from buying a collectors edition, but I don't know for sure). I'd assume that "life giver" just means that it's a healer merc of the set.