In Quake II, Shells are used as ammunition for the Shotgun and the Super Shotgun. A box contains 10 shells. Shotgun Guards will sometimes drop Shells when they die.

Gallery

Quake II
Organization		Terran Coalition of Man · Strogg
Characters		Bitterman · Viper · Willits
Expansions		The Reckoning · Ground Zero · Call of the Machine
Enemies		Light Guard · Machine Gun Guard · Shotgun Guard · Barracuda Shark · Enforcer (Infantry) · Berserker · Gunner · Gunner Commander · Flyer · Parasite · Mutant · Brains · Medic · Icarus · Technician · Gladiator · Iron Maiden · Arachnid · Tank · Tank Commander
Bosses		Super Tank · Hornet · Guardian · Jorg · Makron
Weapons		Blaster · Shotgun · Super Shotgun · Machine Gun · Chain Gun · Grenade · Grenade Launcher · Rocket Launcher · Railgun · Hyperblaster · BFG10k · Grappling Hook
Ammo		Bullets · Shells · Grenades · Rockets · Slugs · Cells
Powerups		Armor (Armor Shard · Jacket Armor · Combat Armor · Body Armor) · Health (Stimpack · Medikit · Megahealth · Adrenaline) · Ammo Pack · Bandolier · Enviro-Suit · Invulnerability · Key · Quad Damage · Rebreather · Silencer · Power Shield
Hazards		Blaster Trap · Electric Track · Explosive Barrel · Explosive Crate · Fall · Laser · Lava · Slime · Teleporter · Vacuum · Water
Barriers		Force field
Vehicles		Drop Pod · Phobos