New Weapons in Halo: Campaign Evolved
Halo: Campaign Evolved adds 9 weapons from across the franchise that weren't wieldable in the original Halo: Combat Evolved, including the Energy Sword for close-range kills and the Needle Rifle for ranged engagements.
The new Operation: Meteorite prequel missions introduce their own set of period-appropriate weapons not found in the main campaign, like the burst-fire Battle Rifle, Brute Plasma Rifle, and Spiker.
Combined with the game's 42 collectible Skulls, which can randomize weapon spawns on replay via the campaign remix feature, there's a lot more loadout variety here than the original 2001 release ever offered.
See the full data: Halo: Campaign Evolved Weapons