The Inferno is a solo minigame that was added to Old School RuneScape on the 1 June 2017, along with an update to the city of Mor Ul Rek. The player must survive 69 increasingly challenging waves, ultimately killing the level 1400 TzKal-Zuk, to obtain the infernal cape. If defeated, the player has to restart from the first wave. A successor to the TzHaar Fight Caves, the Inferno was dubbed the greatest solo PVM challenge to date upon release.[
In order to access the Inferno, players must give TzHaar-Ket-Keh a fire cape. This is a one-time fee, so after giving a fire cape to him, TzHaar-Ket-Keh will allow players to enter as much as they want. Restocking between waves is not possible and other players cannot enter, although the minigame can be paused by attempting to log out between waves. Purple sweets also cannot be used in the Inferno.
A Slayer task of TzHaar does not take effect in the Inferno. If the player has previously defeated TzKal-Zuk, it may be chosen as a Slayer task when assigned TzHaar, which will affect all monsters inside the Inferno. The task will also be cancelled in the event the player is defeated, much like the Fight Caves.
In 2018, the Inferno was made inaccessible on unrestricted worlds to prevent players from practising an unlimited amount of times without supply costs.[2] However, this decision appears to have been reversed since 2021, with nearly all unrestricted worlds since the Equipment Rebalancing Beta allowing players access to it.
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