how strong is eternity

i cant find any infomation in marvel directory of eternity...

Eternity is a celestial being. He embodies the constant of life and etc. At one point he was killed, and then there was nothing. Check out the first few issues of Captain Marvel volume 4, for that storyline.

Apparently they(Eternity and the other Constants) make decisions on who will join them. They have free range to organize anything to any desired outcome to insure the results in favor of whom they see fit. 🪩