How much Lady Tenebris can hit when she brings everyone to center of the room?

Question

I heard some people say that she can kill you with this hit, but I couldn't find any information about how strong this hit is, just want to know to be prepared when I'll face her

Answer 1

The Death Ultimate Explosion attack from  Lady Tenebris can hit 2100-2700 hitpoints.

Source: Lady Tenebris (Wiki Br)