Nu Bi can be found inside the weapon shop in Goldpaw, where he laments the fact that he feels worthless as a weapon maker. He’ll agree to join your kingdom, but he wishes for a monster to be defeated before he does that. Magmanimus is the creature in question and it is a tainted monster. You will find Magmanimus south of Goldpaw, past Sunrise Shore on the map. The enemies along the way are in their low 20s, so you might want to beef your characters up some on them before confronting the target.

Magmanimus itself is level 22 and one of the goo-type monsters, so if you’ve built up your Tactics Tweaker (mainly the Monster Affinities), then put the slider towards the Sliminess option for more damage. The biggest problem with these creatures are that their attacks are quick and don’t really have much in the way of tells. It can spit a projectile at you, plus whenever it jumps, its landing spot will cause you to take damage. It can also hit you when in melee range and when it gets below 50% health, then it will start creating clones. These clones have all of the same moves, plus their own health bar, but if you concentrate on the one without the health bar, then you can quickly take out the main target. Return to Nu Bi in Goldpaw to report the monster’s defeat and finish the quest.