Character Equipment:
Hero Lv. 16
Steel Sword/Edged Boomerang
Bronze Armor
Brozne Shield
Fur Hood
Bunny Tail
Yangus Lv. 16
Farmer's Scythe
Fur Poncho
Bronze Shield
Fur Hood
Bunny Tail
Jessica Lv. 14
Snakeskin Whip
Leather Dress
Scale Shield
Bunny Ears
Gold Bracer
Basic Strategy:
Even though i didn't use it in this battle, Sap is awesome against this boss. Keep using psyche/regular attacks against him and you'll win. When he summons some friends, ignore them and continue killing the tortured soul.