The Pentacle is a large star-shaped puzzle made of stone. Other than the Avatar, it is the last defence of the artefact needed to enter Valhalla. Activating the Pentacle opens the large rune gate to the area watched over by the Avatar.
To activate the Pentacle, one person must start at a particular star point, near the rune gate, and walk down the inner lines of the star.
Every time the person makes a mistake, an Undead Warrior will emerge from the coffin at the centre of the Pentacle and attack anyone nearby.