Yux

From the Super Mario Wiki

This article is about the enemy first encountered in The Great Tree in Paper Mario: The Thousand-Year Door. For information about species of Yux, see here.

Paper Mario: The Thousand-Year Door Enemy
Yux

Max HP	3
Attack	2
Defense	0
Location(s)	The Great Tree, X-Naut Fortress
Log	These pathetically ugly creatures were created in X-Naut laboratories. With Mini-Yux around them, they're impervious to all attacks.
Items	None
Moves	Ring Toss (2)
Tattle	That's a Yux. Says here it's a creature created in the X-Naut labs. According to this, attacks and items won't affect it if it has Mini-Yux around it. So if any Mini-Yux appear, take those out first. Duh!
Bestiary 109 110 111

Yux are X-shaped creatures that were created by X-Naut PhD and can create Mini-Yux to create barriers around him. They appear in Paper Mario: The Thousand-Year Door. They are first encountered in the Great Tree where they are used as security by the X-Nauts. Later they appear on the X-Naut Fortress on the Moon, but are less in number here.

[edit] Related Enemies

From left to right: Yux, Z-Yux, X-Yux
Mini Yux, Mini-Z-Yux, Mini-X-Yux

[edit] Trivia

Similar creatures called Barribads, appear in the game Super Paper Mario; they resemble Yux in how they form protective barriers, and their faces are physically similar.
Another Paper Mario: The Thousand-Year Door creature known as Grodus X also resemble Yux. While they are small and protect Grodus in a method that is similar to Mini-Yux, they are the same colour of green as Yux, and are also cross-shaped (though with smaller arms). Additionally, a Grodus X's single eye looks like a Yux eye.
There is a Sammer Guy in Super Paper Mario called Yowling Yux.