It will always be down to the Nerevarine and the Champoin of Cyrodiil.
Edit: Nerevarine wins. Forget what I said earlier. The Nerevarine has already killed Vivec, Almalexia, and Dagoth Ur. These three are gods not to mention. He also fought with countless cliffracers in his long stay in Morrowind. The Champion of Cyrodiil just closed the gates of Oblivion and drove Dagon back there.
The Nerevarine also cast more spells than the Champoin of Cyrodiil, not to mention the Nerevarine's uber enchanted rings, robes and armor.
:foodndrink:
Pssshh.
Vivec is still alive (like Luagar said), though I will say that killing Voryn and Ayem are feats in themselves (though they lost godhood upon Heart removal). Consider lore and not game mechanics. Heh, and how can you downplay something like
stopping an actual Daedra Lord and a demon invasion??? Dude... he LITERALLY battled the personification of Destruction and lived!!
Also note that Martin, in Aka-Avatar form, defeated Dagon.
Forgive me for skipping the first post, for this next bit may be irrelevant, but MK has stated that, if we're considering all of Existence, Talos is the strongest "being;" he IS basically an amalgamation of certain quote-unquote BAMFs.