What level for Reha Arena of Death?

[N3MES1S]

I encountered more difficult the first battle than the second one. Paladin on hard difficulty, but i found a perfect army and i almost never lose a troop (almost pure humans, royal griffins, paladins, inquisitors, archmages and guardsmen, horsemen instead works well too). With mage this game turns a bit hard, but with paladin/warrior is almost too easy. The most important thing if u are a paladin or warrior is to raise your def and atk. I just get all my troops next to the paladins (i dont use dragons cuz i cant resurect em) or i use teleport on paladins to kill 2/3 enemy troops on the first turn. Then i teleport em back to the army group. I use resurrect and inquisitors to refill the troops (resurrect level 3) and i use paladins res at the end. I also have the resurrect skill that gives me back the rest of the fallen buddies -.-