Kritias as a replace for Future Ereve?

They don't have 50mil hp either its more like 20-30mil hp at most, unless you're talking about the mini bosses.

edit: after rereading over again, you're right but, they don't have that much hp lol.

They actually do have 40-50m hp. It's rather easy to test if you have WH character card or something. The normal mobs outside of invasion have 20-30m. My mobbing skill takes those out in one hit, but I don't do enough to OHKO the ones during invasion.