RuneScape 3 icon
Old School RuneScape icon
Greater Demon
Released 27 February 2002 (Update)
Pay-to-play Yes
Combat level 90
Max hit 10
Stats (?) 90 / 90 / 90
Hitpoints 90
Experience (?) 150
Ranged XP (?) 200
Hits XP (?) 50
Fatigue (?) 2%
Hostility Other (?)
Poisonous No
Poisonable Unknown edit
Weakness Silverlight
Examine A freshly summoned demon

Thrantax is a demon encountered during the Merlin's Crystal quest. The demon is summoned by going to the pentagram east, northeast of Camelot Castle, lighting a black candle, and dropping bat bones on the pentagram. Afterward, the player needs to recite the magic incantation "Snarthon Candtrick Termanto" to vanquish the demon and progress with freeing Merlin.

If the player uses the wrong incantation, the demon will attack the player for a brief period of time before disappearing or either opponent is defeated. Like other demons, Thranax is weak to Silverlight if the player wields the sword when combat is initiated. The player will require a new black candle to try the ritual again, however, the bat bones are return to the inventory.

Thranax is one of many demons that has the same appearance as a greater demon.


This article on a monster has an associated dialogue page.


Duplication glitch

Main article: NPC duplicate glitch
Thrantax glitch

Several players stand by as Thrantax is cloned 64 times.

The NPC duplication glitch is simple to recreate unintentionally in the case of Thrantax - a demon summoned during the course of the Merlin's Crystal quest. After summoning the demon and spawning an NPC, the player is given dialogue choices. However if they click out of the dialogue, the demon will remain but will not be able to be attacked. This allows for the player to repeatedly drop bat bones, creating a teleport animation and new NPC to appear each time the bones are dropped. This does not consume the bat bones. In testing, up to 64 demons were able to be spawned before new NPC's ceased to be created.

Later versions of RuneScape

It is also possible to continue summoning Thrantax in later versions of RuneScape, although he appears as a ghost in both Old School RuneScape and RuneScape 3, and he is not duplicated in the process of dropping bat bones repeatedly.

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