well nothing special tbh just use their special attack with which they decimate the front 3fields
onslaught maxed for initial onslaught
haste/teleport/gift
phantom lvl3
later with Issharas whip and the poison dagger (+1fire/+1poison dmg) or damage increasing items on specific creatures like dragonslayer sword etc. AND Reaper's TimeBack its a total slaughter.
TimeBack is the BEST rage ability in the game, its like full ressurection+gift+initial round bonus altogether