H3E is a sandbox overhaul for Halo 3 in MCC, the sandbox was redefined for primarily multiplayer but is campaign compatible and provides a different experience despite having the same enemy encounters. Weapons are designed to be competitively and socially viable while providing fun for all players.
New colors and ranks for Grunts with added effects for blowing their backpacks off.
Peach/Orange: Minor, lowest rank and HP
Red/Crimson: Major, average grunt
Pink: Assault, throws spike grenades and lower chance to retreat
Dark Green: Heavy, very high HP, throws firebombs and tends to use stationary weapons
White: Ultra, decent hp with fast recharge
Bright Green: Trooper, Ultra but with shields
Blue: Stealth, miniscule shields but can cloak
Black/Dark Blue: Spec Ops, throws plasma grenades often
Gold/Yellow: Zealot, high HP and shields with fast recharge rate and a tendency to dodge attacks.