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If we take into account Daemons, and not the Warp gods into my personal tier rankings...

1. The Emperor
2. Magnus the Red, some monstrously powerful Lords of Change like Aetaos'rau'keres, maybe some other powerful Daemon Princes. Post-Ascension Lorgar is possibly also here.
3. Ahriman, Eldrad, Malcador, Lorgar, generic Lords of Change.
4. Various Alpha Plus psykers, Kor Phaeron and Erebus (Kor Phaeron managed to use his psychic powers to actually lay a Primarch low, and Erebus is said to be comparable).
5. Chief-Librarians, other powerful Imperial Psykers.

I am unsure where I would place a generic Farseer, since measuring Divination is a bit tricky.

That would probably be my list Maby kor phaeron 1 higher not sure.

I thought I read something somewhere about Gregor Eisenhorn being the most powerful after the Emperor.

Scratch that. It is incorrect.

Really where was that? On the wiki it claims Tigrius (sorry if a misspelling) or Mephiston are the two most powerful after the Emperor in the imperium.

 Terentius wrote:
I thought I read something somewhere about Gregor Eisenhorn being the most powerful after the Emperor.

He isn't. Eisenhorn met, at various times, psykers who simply outmatched him. He might have destroyed the daemon Prophanti but even that is merely an assumption, with no definite proof offered.

Yeah, Gregor many times outright states a psyker is more powerful than he is.

Commodus Voke, Quixos, Heldane, Ravenor, Dazzo, the various psykers released at the start of Malleus, all are more powerful than Eisenhorn.

Ravenor is the most powerful out of them isn't he?

i think weirdboyz are pretty powerful psykers i mean they can control orks! How many psykers do you see control orks every day with the ork still happy

Um anybody using telepathy?

BaconUprising wrote:
Ravenor is the most powerful out of them isn't he?

Well, I haven't read Ravenor so I can't do much in ways of a feat by feat comparison with other big hitters in the mythos, but of those men, yes, IIRC he is the most powerful named psyker. Only the Alphas and Alpha Plus psykers are likely more powerful than he is of that list.

I mean, he psychically operates and delivers death to heretics on a lazyboy, that's brutal as feth. The Farseers also seem to respect his capabilities.

Also, Weirdboyz are sort of a wild card. While they can be born with exceptional ability (Like Zogwort), to a certain extent their power will always be dictated by the amount of Orks around; they tap into the Waaagh! field.