strength-nature, order-death, nature-chaos.
There's not much to say, in the first battle, I got lucky with the blind effect from the summoned unicorns. In the second battle, due to the lack of a turn order table (like in Heroes 3), I didn't block two stacks of titans, which, after waiting and removing all buffs, killed both heroes. It's difficult to counter nature.
Thank you for the interesting battles!