Exor

"HALT! Who goes there!? A Trespasser! The castle now belongs to us. The Smithy Gang. This will be our first step in taking over the world. And if it wasn't for nosey characters like you, we'd practically own this world! Let's see you deal with this!"

- Exor

Exor is a massive sword-like member of the Smithy Gang and a major antagonist in Super Mario RPG: Legend of the Seven Stars. Exor is actually composed of four parts: his Left Eye, his Right Eye, his Mouth (which is inexplicably translated Neosquid), and the skull-shaped pommel (named Exor) that controls the entire body. Exor is used as an inter-dimensional gateway between Mario's dimension, home of the Mushroom Kingdom, and Smithy's dimension, where Smithy's Factory is located. Consequently, Exor can transport an infinite number of troops and weapons for the Smithy Gang.

The iconic and recurring image of Super Mario RPG: Legend of the Seven Stars is Exor embedded in Bowser's Keep.

History
Exor, on his descent to Bowser's Keep, shatters the Star Road, breaking off seven Star Pieces, thus eliminating the power of wishes from the world. The giant sword crashes into Bowser's Keep, sending Mario, Bowser, and Toadstool (who were battling in the castle) flying to other regions of the world. The keep is occupied by the Smithy Gang, and is used as Smithy's base of operations on Mario World.

Mario returns to Bowser's Keep in an attempt to find Princess Toadstool, only to meet Exor. Exor claims the keep in the name of the Smithy Gang, and soon destroys the bridge linking Bowser's Keep to the rest of the world, requiring Mario to find another way in.

Eventually, after collecting six Star Pieces, Mario returns to Bowser's Keep via a bus driver from Nimbus Land. After Mario defeats Boomer, he and his party are brought to the roof of the castle. Once there, they engage Exor. Following his defeat, Exor inhales Mario and his party, transporting them to Smithy's dimension.

After Smithy is defeated, Exor dissolves into nothingness.

Trivia

 * In a televison commercial promoting the American release of the game, this character was erroneously referred to as "Smithy the Sword", probably also suggesting that he was the main antagonist of the game.
 * According to his Psychopath thoughts, Exor has astigmatism in his right eye and is blind in the left one.
 * Exor is the only Super Mario RPG: Legend of the Seven Stars boss (aside from the Yaridovich clones) that is not immune to the special effect of the Geno Whirl attack (which does 9999 damage if executed correctly and defeats him in one turn).
 * Exor's name may refer to Excalibur, the sword from the story of King Arthur.
 * Although the face that holds the Neosquid, Right Eye, and Left Eye is actually Exor, due to the Neosquid moving at the beginning of the game, the in-battle calls the non-mouthed skeleton brain Exor.