|Signs of nearing||Roars and breathing|
|Theme song||Argonites 2|
The Argon Guardian (originally as Kaidun) is a boss in Slender Fortress.
Kaidun was an Aman General in charge of the area of Acarum. He provided his lover, Fraya, the Leader of Allemantheia, with a pendant that glowed as long as he was alive.
He was later captured by Thulsa's forces who then converted him into one of the Argons. The player is tasked to locate Kaidun and free his soul from his new corrupted body.
He is also one of the Big-Ass Monsters (BAMs) located in Necromancer's Tomb and is the third boss in the instance.
He does not possess any unique abilities compared to other BAMs of his type. He does have a habit of randomly targeting a random party member and charging towards them. Fortunately, this move is very easy to dodge.
In Slender Fortress Edit
The Argon Guardian was the Second largest boss in boss pack 2. He is an un-stunnable being that is able to decapitate you with his big-ass sword. The Argon Guardian is the first fastest and hardest giant boss to outrun when being chased. Once he starts to swing his sword, there is no chance to outrun him with the expection of turning a corner before he swings which can have you a chance to run. To avoid this boss, find a corner to hide in after doing alot of corners and try to be as far as you can to outrun him.
- The Argon Guardian is the first boss that has a Mega-body model. The other Mega-body boss is the Sha of Fear.
- This boss, and all TERA bosses [Expect for Alpine Predator], was removed. Glubbable said that the Argon Guardian is not fitting for this game mode. The reason for this fact is unknown. Rumors suggest that there may be other reasons for the removal of this boss.