Janus is a follower of Sliske who opened rifts to the Shadow Realm throughout Gielinor as part of the Runecrafting & Summoning Rifts event. He is a former member of the Zamorak Magical Institute who was expelled after his mentor was injured by one of his experiments. He may currently be found in the Empyrean Citadel, underneath the eastern balcony.
During the event the rifts he summoned could be closed by the player through the use of Runecrafting and Summoning. He appeared next to the Small Rifts. After the bar on every small rift was filled, it would disappear, and Janus would yell "You must not distract me like that!", before disappearing into another location to open up another rift.
- His name is a reference to the Roman god Janus, the god of doorways and passages.