Grotesque souls were a promotional Treasure Hunter prize that were used to unlock Grotesque Armour. They were available as rewards from 27 January to 1 February 2016. 10,000 souls may be released every day to give up to 50,000 experience in Prayer or Slayer (depending on your skill level). Grotesque souls were also able to be obtained by killing any monster once every 10 minutes, granting 50 souls, or 100 souls if that monster was a Slayer task.
Beings that do not actually die do not count as a kill for grotesque souls, e.g. Cadarn rangers.
- Initially upon release, players were able to sell grotesque souls for 2,100 coins each to any general store. This made them a profitable investment and one could make an easy 105,000-210,000 every 10 minutes collecting them to sell to other players and to general stores. However, hours after launch, the ability to sell them to general stores was removed in a hidden update, removing the minimum price of 2,100 coins from the item entirely.
- A single player could acquire 57,600 souls over the course of the event from slayer task monsters (100 souls x 6 drops an hour x 24 hours a day x 4 days), or 28,800 from non-slayer task monsters.
- If it appears on the ground, it has white wings.