Skulls
Find out what all the Halo 3 campaign skulls do.

Gold Skulls

Iron Skull
This skill makes it so that if you die, you'll have to start from the beggining of the level.

Black Eye Skull
When you're shields drop you have to melee an enemy to regain them.

Tough Luck Skull
Enemies will constantly rush you and throw stickies right before they die.

Catch Skull
Enemies will throw a ton of stickies. (Can be very annoying dieing because a small grunt got lucky with a sticky)

Fog Skull
Motion sensor is disabled.

Famine Skull
Dead enemies drop half the ammunition they would usually drop.

Thunderstorm Skull
All enemies are upgraded.

Tilt Skull
Enemy armor is freakishly stronger.

Mythic Skull
Enemy health increases by 2x.

Silver skulls

Blind Skull
Player loses their HUD and interface. (meaning no ammo info, radar, shield, ect)(Still retains crosshair)

Grunt Party Skull
Whenever the player gets a headshot on an enemy grunt their head will explode into confetti and the sound of children screaming "Yay!" will be heard. (pretty amusing skull)

Cowbell Skull
Increased explosion radius.

IWHYBD Skull
New ingame dialogue appears.