A Quake II add on with a few new weapons, monsters, and levels. The Earth fleet attacking Stroggos is stranded in orbit due to a Strogg gravity well. The player has landed on the planet with one mission: destroy the gravity well.
New weapons include the chainsaw, the ETF (explosive-tipped flechette) rifle, the proximity mine launcher and the plasma beam. New power-ups include tesla mines, the defender sphere, the vengeance sphere, the hunter sphere, and the doppleganger.
New monsters include the turret and the stalker. Enhanced enemies are the medic commander and the daedalus. The medic commander can revive fallen monsters or attack with a hyperblaster. The daedalus features twin blasters and a power shield. All monsters have better AI.