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I recently defeated a Nimus Hive (it appeared randomly). Here it is facing him... At least I won with an impressive lead in golems. I can barely keep up with deploying my army; just move the towers away from your troops and closer to the enemy.
In general, only Or seems to be able to defeat him with a 90% probability, especially with Armageddon... That's for sure. Dwarves have a 50/50 chance. I really don't like playing against Iris... Once, I got Iris-Iris randomly... I barely managed to win. Now I always play on random because I know the game inside and out. But stupid foreigners keep choosing Nimus or Dwarves and starting the game, even though I have a neutral faction... It's annoying sometimes.
I definitely remember that you can't use the summon ability against Iris with a Djinn; her mirror spell is too strong.
I like both Warlocks (Lethos and Sinistar). If Lethos poisons almost the entire army and you combine the scouts, you can have an interesting battle (if it's not against a Necromancer).
For some reason, I keep getting Garuna 40% of the time in random games. I don't know what to do with this lady anymore :D. Once, she appeared three times in a row :D