Liquid Pyrite

Liquid Pyrite is a combustible fuel source used for unknown purposes in Ulduar. Transported by the Mechanolift 304-A, these containers have found a use by the Hired Demolitionist... being thrown and exploding.

Liquid pyrite is used as ammunition for the Salvaged Demolishers:

• Hurl Pyrite Barrel: Driver ability, Hurls an orb of blue pyrite into the distance, dealing damage, but consumes ammo.
• Increased Speed: Passenger ability, Injects liquid pyrite into the engines, increasing movement speed by 100%. Lasts 20 sec.

• Liquid Pyrite is actually considered a NPC, although it behaves much more like an object. This was probably necessary so it could be picked up by the vehicles.
• Salvaged Demolishers start with a full tank of pyrite. When they use a repair station, this also maximizes their pyrite store.