true in that hero battles are a killer for the last hero usage
last hero is only suitable vs heavy melee enemy stacks (which there should be enough in freedom)
try to lure them to a narrow gap
so u can fully use the potentional of last hero
and yes it requires one creature stack or 2-3 something that can be RESSURRECTED by inqi's
let all enemies pile upon that stack and wait until there are few units left and use resu on it
but then again it's easier to do with gif/ resu
last hero is hard to use ^^