Arrghus

Arrghus is the guardian of the second Crystal in the Swamp Palace in A Link to the Past and the Eastern Temple in Four Swords Adventures. Arrghus protects the portrait of sage Oren in the Swamp Palace in. Arrghus is also a mini-boss, known by its Japanese name Wart, in the Great Bay Temple and the Secret Shrine in Majora's Mask.

Characteristics
Arrghus is a large, one-eyed jellyfish which is surrounded by several miniature polyps named Arrgi. These Arrgi and the creature's ability to float make it invulnerable to attack. Its method of attack is to send the Arrgi swirling outwards. The Arrgi must be pulled away using the Hookshot, and then destroyed with the Master Sword. When all of the Arrgi are gone, Arrghus launches itself into the air and attempts to crash straight down upon Link, then it speeds across the shallow water of the room. It will also shoot needle thin lasers at the ground, which will create huge explosions, throwing columns of water into the air. In this state, it is unprotected and can be attacked with Link's sword or other weapons. After each hit, it attempts to crush Link from above again, or shoots more lasers at him, but persistence leads to its defeat. After its destruction, in, it leaves behind a Heart Container and Link is presented with the second Crystal in which one of the Seven Maidens is imprisoned. In, it will leave a Heart Container as well as the portrait of sage Oren.

Orange Arrghus
An orange Arrghus is the guardian of the Green Four Sword fragment in the Game Boy Advance version's Palace of the Four Sword. Instead of Arggi, this Arrghus is surrounded Bari, like Barinade in, which will sometimes shock Link when he pulls them away from their host. This Arrghus is also stronger, faster, and sturdier, and once the Bari are removed, it is able to both change direction while skating around, as well as summon swarms of Kyameron.

This Argghus reappears in as the boss of the Swamp Palace, but is covered in Arggi like the original. It is able to fire lasers which boil the water underneath Link.

Stone Arrghus
The Stone Arrghus appears as the boss of Eastern Temple in Four Swords Adventures, with a look more similar to its Majora's Mask counterpart. To defeat this stone version of the boss, Link must use his boomerang to pull the rocks to him and then hack them with the sword. Once all the small rocks have been destroyed, the large, gigantic eye attacks Link. Once it has been hacked at enough, it disintegrates and leave Link with the Yellow Maiden.

Wart
Arrghus, known by its Japanese name Wart, is a huge eye mini-boss that rolls around trying to hit its enemies in the Great Bay Temple and the Secret Shrine in. It attacks and is defeated like its previous incarnations. At the start of the battle, Wart is hovering slightly above the ground, completely surrounded by a mass of bubbles, rendering it immune to any damage. It is a time-consuming enemy. The sheer amount of bubbles on it make it a long struggle to pierce its shield, as it is constantly moving, along with Wart, which will differentiate from retreating to trying to press itself against Link in an attempt to cause damage. The bow is not a good idea at this point, as there are simply too many bubbles. Any offensive weapon is capable of removing the bubbles, although the best is the bomb, which knocks many bubbles off at once. Using the Hookshot is another way of removing the bubbles, although it is a time-consuming way. Another great way is to use deku nuts, which not only destroy many bubbles in one shot, but also damage the Wart too. The bubbles are incapable of being destroyed while on Wart, only knocked off, which makes them even more of a pain. When an opening is finally made, and Wart's eye is no longer blocked by bubbles, the bow is the way to go. However, any projectile will work. After enough shots, Wart will enter stage two, forcing its surviving bubbles off its body and begin rolling around wildly. First finishing off any bubbles, then attack Wart with the bow. After a few more shots, Wart will be finished.

A Link to the Past comic
A creature resembling Arrghus is featured in Chapter 9 of the A Link to the Past comic. Fought in the Swamp Palace just like in the game, the monster is shown as a bright red jellyfish that attacks with tentacles, but no eyeballs are shown. In the comic, as Link makes his way to the imprisoned Maiden, a large, tentacled monster attacks him. He thrusts the Master Sword into the monster and defeats the creature, which spits out Link from inside and gives him a  chance to destroy the floating crystal where the maiden is.

Trivia

 * It is likely that the name "Arrghus" is a reference to Argus Panoptes, an all-seeing hundred-eyed giant from Greek mythology.