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It's not entirely clear why the discussion about Nimue's overpoweredness is in this section, as she's only overpowered in 3.0, and in 2.1, she's almost the biggest loser.
Nimue consistently rushes with the Hive (protect your golems – they are your main potential; send tomb guards to multiply damage – and that's it).
Anwen rushes if you cast Fire Trap on her arrow (this is the end for phantom creatures), and considering that Nimue's army is far from being a ranged one, and given how many sworn enemies Anwen has, with skilled play, this duel is won 90% of the time. Ossir can also defeat her under certain conditions.
Ossir... What about Ossir? If he's in the hands of a decent player, Iris won't defeat him (as an example, my game against Bloomer, and I think we're not the weakest players – the Iris vs. Ossir duel is in the replays thread, with Ossir winning).
But Ossir is easily defeated by Leto (the main thing is not to forget that Leto has a teleport to his hunters (one stack of archers is easily defeated) and vampirism on the witches), and he also poisons her at the beginning. Another option is Helmar. Due to his built-in evasion, he also has a chance, although with the new archers, his chances have noticeably decreased. So, Ossir is far from being overpowered. But Vittorio tears him to pieces with his overall dispel!
In turn, Leto is easily defeated by Anwen. And Anwen herself is defeated by Daedra (although not always, again, in the 1/8 finals of "Life in Twilight," there were 2 such duels – in one, Daedra won, and in the other, Anwen). So, a more reliable counter to Anwen is Marbas. He has a high chance of defeating her.
Marbas himself is defeated by Vittorio, who won't be able to do anything against Ravenna. The list can go on and on. But for me, there's only one overpowered hero – Karl, with skillful rune play, he's simply unbearable (check out what a pun I came up with!)