General impossible difficulty (no loss)

[Zechnophobe]

Level 5's are perfectly viable, due to Turn back Time spell. Since you can resurrect an infinite number of level 5's, so long as they all die in the appropriate turn order, it makes them very efficient tanks, especially fast moving ones like red dragons or Ogres. Frankly I spent the majority of my impossible, no kite paladin game using 3 or 4 (occasionally 5!) stacks of level 5 units. They just don't DIE very often, and target on the first turn can often make for an effective TBT on the second turn.

[Ish]

I didnt see timeback spell in my whole game? (warr impossible)

I wasnt going for no losses in any case so no biggie, but would of been nice!

Btw hi Chase

[squallcs12]

I'm at level 13 and has just 2 dmg spell on my hand is Flame Arrow and Poison Skull. And my army has only 1 troops - Bone Dragon (1) (Init 7, Action Point 7).
At the beginning of the battle, cast Flame Arrow or Poison Skull to the highest HP enemy troop, then let my Bone Dragon wait - make sure it has highest init also. Then after enemy move, Bone Dragon fly to near the enemy troops, using ability Poison Cloud to dmg all nearby enemy. Then the next turn, move my Bone Dragon to a cell that can not be attacked by any troops and wait for Poison Cloud reload. Repeat this until defeat all enemy troops.
Each battle take much time than usual (about 50 - 70 turn) but I win for sure without loss. If combat with a enemy heroes, make sure that hero doesn't use any dmg spell like Flame Arrow or Ice Snake...etc.
I travel to all reachable islands and pick anything like gold + spell scroll + treasures ... without fight with any enemy. After that, begin fight with the weakest enemy and go on to win the game.

[Zechnophobe]

And what if you are up against archers? A stack of priests should likely be a bad thing to deal with.