Mod requests (orders).

How does that work?

I played as a hero with a special ability in a mod for the element city. At the beginning of the battle, he releases a beam that shuffles the turn order of the units.

He doesn't do that in a siege...

The tank attacks in 2 stages - first, the hero attacks, then there's an explosion that deals area-of-effect damage. If the hero kills a creature, the explosion won't deal damage to anyone, but the explosion animation will still play.