Skull Tooth

A skull tooth is a red gem which can be obtained by opening a Tricky Treasure in Rayman Origins. There are a total of ten skull teeth and the player must give them to the Grim Reaper at the Snoring Tree. Once they have all been collected he'll open the entrance to The Land of the Livid Dead. To unlock a Chest Chase level (where the skull teeth can be found), a certain number of Electoons must be collected.

In such a level, the player must chase the chest throughout the level by sprinting non-stop. At the end of the level, the chest will come to a dead end, allowing the player to smash it open and obtain the tooth inside.