Counter-heroes in duel mode (3.1).

I agree. I just checked myself – Sinithar is much stronger, there was some lag when I played online. Sinithar versus Erinn – Erinn’s army simply prevents Sinithar’s army from moving; Erinn adds lightning bolts, which she has enough mana for, since Sinithar actively spends it. But Armageddon usually decides the battle in Sinithar’s favor: if the first one was unsuccessful, he almost always manages to cast the second one.
Erinn versus Ravenna: Ravenna can win with approximately the following tactic: attack with frost, prioritize targets: harpies, megeras, witches. Concentrate physical attacks on harpies, then kill the lizards. When I simulated the battle, I won, and I didn’t use resurrection even once; I only used cold spells, since no more than 2 units were affected by the ring. My opponent online didn’t seem to use Ravenna’s chaos spell at all...