Blackguard Chaplains (bug?)

So I encountered blackguard chaplains in maps a while ago (breach), took a vid showcasing their insane regeneration ability but never saw them again since. Anybody else met these monster before?

What happened? Were they removed from game or were they monsters developed for 3.0+ that made it into game for a short period accidentally? Or just random stuff not implemented?

These monsters supposedly.

Nobody else has this experience? :(

It appears to me that you didn't notice a little detail when you did that map. Those guys usually don't spawn and are only created by the "Area contains additional monsters that heal" sextant mod.
I hope this answers your question(s).

Thank you!

I forgot about sextants :). Looks like if we got sextants maybe we can reliably force their spawn.

But i once tried unbreathing queen spectres and they don't use any of their skills such as flame dash and lightning warp :(