Ultra

An Ultra (also known as Boss in Destiny 2) is the most powerful type of enemy in the Destiny series due to their high damage and health values. They can be identified by their large sizes and the way their health bar is displayed: shown as a giant yellow bar with a skull symbol in it (formerly as a skull next to the bar in Destiny.)

Gameplay
Ultras serve as bosses and are therefore meant to pose a challenge to Guardians. They appear in Story missions, Strikes, and Raids; rarely will they appear during Patrol, usually as part of a World Event. Any Ultra will have the following abilities:
 * Area-of-Effect Melee Attack
 * Heavy Ranged Attack (from their equipped weapon)
 * Summon Reinforcements
 * Rapid Movement
 * Immunity to Flashbang and Suppression Grenades

List of appearances

 * Destiny
 * The Dark Below
 * ''House of Wolves
 * The Taken King
 * April Update
 * Rise of Iron
 * The Dawning
 * Age of Triumph
 * Destiny 2
 * Curse of Osiris
 * Warmind
 * Forsaken
 * Black Armory
 * Joker's Wild
 * Penumbra
 * Shadowkeep