HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

Why is fire taken less often on level-up than earth and air?

Added 1 minute ago

Waiting for the HD-mod 3.52 + Deletes Heroes 3 from the computer :)

I don't know, I was playing through a campaign right now - the berserker was very helpful, he could take down any hydras or behemoths with a group of goblins and riders.
Could slowing or speeding do that?