Helix Stone

Helix Stone - Powerful demonic artifact featured in Doom (2016). It is a large stone with a symbol on it (the same symbol can be found used by the Night Sentinels (holographic knights) and is also found on the armor of the Doom Marine.

Doom (2016)
Helix Stone is a demonic stone, which player spot at the end of level Lazarus Labs. It was first mentioned by General Hayden while Doom Slayer uses an elevator to go deep into UAC Base, where he says, that only few had a chance to see it.