Ultrus is a recurring monster in the Dragon Quest series.

Introduced in Dragon Quest VIII: Journey of the Cursed King, it is a giant, crown-wearing blue Slime (much like a King slime) although it is so massively fat that its crown appears small. Its moniker is "Ultrus: The Ultimate Slime".

Appearances

Dragon Quest VIII: Journey of the Cursed King

Find the three small slimes scattered across the world. There's one by Trodain, one by the autumn church, and one near Empycchu. After putting the Slime Squad in the monster team, they (Smiles, Slime Shady, Tori) will combine and the player will obtain Ultrus.

Attribute Stats
HP 907
MP 254
Strength 525
Resilience 302
Agility 116

Ultrus always acts twice per turn, can heal himself with Omniheal, and rain hell upon his foes with Starfall. These catastrophic comets hit for 80~96 each, and carry the same attribute as Boulder Toss and Stone's Throw.

Ultrus has incredible staying power when he enters the fray, capable of turning the tide of even the most doomed battle. The problem is keeping his components alive long enough to fuse in the first place--yet another example of Yuji Horii's gambling-based philosophy when it comes to game difficulty.

Dragon Quest Monsters: Joker 3

Dragon Quest Monsters: Super Light

Similar fusions & close cousins