In order to find the Boss. You need to find the teleport

statue which is located at coordinates 113 - 109

Drop:

+exe +skill +Luck +1 Option 

Bloodangel Sword
Bloodangel Magic Sword
Bloodangel Claws
Bloodangel Scepter
Bloodangel Staff
Bloodangel Stick
Book of Bloodangel
Bloodangel Bow