Rufus 4th Job : Arbiter

Rufus receives his final support weapon, the Soul Arbiter, capable of dealing sustained amount of damage to its enemies. 

For an unknown reason with this job Rufus' hair seems to have changed color.

According to his brazilian profile, Rufus's change in hair color represents him reaching the pinnacle of his abilities and raising his power to the fullest.

Oddly enough, Rufus does not retain this hair color when selecting Arbiter in training mode. He retains his normal brown hair. 

Rufus' 4th job is known as Prominence in the foreign servers, KGC (Korean Grand Chase) and GCPH(Grand Chase Philippines).
Rufus is seen using Eyeteeth and all 3 supporting weapons when he uses his last, yet ultimate special, Expunge.

Rufus receives his final support weapon, called the Soul Arbiter.
He receives his final speed increase in his dashes, and his final increase in his AP Recovery passive skill.
Rufus's skill Expunge is based off Blazblue's Noel Vermillion's Astral Heat attack (most resemblance at last hit).