This obnoxious critter is created by the skill `Fission`. While the Promy Dem boss (the Progenerator) gets this skill, it spawns an Offspring; only the Promy Dem ENM boss (the Ingestor) spawns a Neosatiator.
The Neosatiator is named after the Promy Dem NM.
Fission can be blocked with Hysteroanima. You may never need to see this enemy. He's a miniature clone of a Gorger and is not hard to deal with. The problem is when multiple Neosatiators start roaming around...
* edited and corrected thanks to the super-helpful post below - you'd think I'd read my own frickin' guide when posting about Promy stuff, eh. ^^
Edited, Mon Mar 7 16:14:47 2005