Modifiers

Skulls modify the difficulty of a Story Mission or Strike. Please note that in Heroic and Epic Skulls, the entire encounters are changed. More and more powerful enemies become available. They even have smarter A.I. Nightfall is similar to hardcore mode in other games. As soon as your fireteam wipes, you are kicked out of the mission or strike.

Skull Modifier	Effect
Anger Issues	Minions of the Darkness display heightened aggression.
Angry	Minions of the Darkness won’t flinch, even after massive damage.
Arc Burn	Arc damage from any source is greatly increased.
Epic	Heavily shielded and highly aggressive enemies appear in great numbers.
Heroic	Enemies appear in greater numbers and are more aggressive.
Juggler	No ammo drops for your equipped weapon.
Lightswitch	Minions of the Darkness deal much more melee damage.
Nightfall	You will face a relentless army that has never known defeat. If all players die, you will be returned to orbit.
Solar Burn	Solar damage from any source is greatly increased.
Void Burn	Void damage from any source is greatly increased.