What is Apparition archnemesis?

I just briefly met one of them in a Kirac map. I find no information on it in wiki but my search-fu might be off.

Apparition was, actually, a Nemesis modifiers. The Rare monster with Apparition, on death, will reanimate a spectral copy of itself and all nearby enemies which have left a corpse

Why would it be in the game together with archnemesis? It's not listed by the lead dev in that lengthy post about mods.

With 3.18 patch, some Bloodlines and Nemesis modifiers were turned into Archnemesis modifiers (Apparition, Storm Strider/Lightning Mirage, Voidspawn of Abaxoth...).
I guess the lenghty dev post only covered those Archnemesis modifiers that would have been eventually nerfed from the next patch barrage they threw at the game.

Apparition would not fit into since, well, it's kinda binary on its effect, thus difficult to nerf