Helheim Power Stone
From WikiRaider
The Helheim Power Stone is a key item found in Tomb Raider Underworld, in the level Helheim of the Arctic Sea Section.
Lara has to collect four Helheim Power Stones in order to power the mechanism needed to open the drawbridge into Helheim.
Description from PDA
One of multiple keys needed to open the drawbridge to Helheim.
Images
Helheim Poer Stone in-game
Image of the Helheim Power Stone in the PDA
