GAAP for example. I wait until my party is level 60 or so, and my Gladiator has GM Spear (2 Gungnirs, if possible), my Assissins have 20+ GM Blade with 2 daggers each (artifact daggers, if possible). and my Priest with GM Light and +10 or better Expert Dark (and able to cast poison cloud).I just run up to him, hold down the up arrow key to minimize his buffeting skill and let my Galdiator and assains melee him to death while my Priest casts poison cloud at his feet. If the party starts getting low on HP, my Priest will cast Divine Intervention when necessary.
A bit of overkill, I agree . . but very effective!