Masteria Expansions, Names and the proof for each

Much like Hobis, but corrupted in a bigger way, more like Zakum.

edit: What if Naricain is a summoned boss, and/or you have Subani to fight alongside you?

I'm pretty sure Subani sealed Naricain up, then he disappeared. But you never know with Masteria. XD Naricain might pop up as a boss sometime, like if somone broke the seal, though. You could summon him by breaking it, maybe!

Edit: Isaac beat me by a minute.