: They change tactics and gain new abilities as their health drops. Destiny 2: The Harbinger Mission & Title
The "Harbinger" refers to both a challenging exotic mission and a prestigious player title. The Harbinger Mission (Hawkmoon) The HarbingerHD
: You must complete the campaign and progress through the Monolith of Fate until you reach level 90 Timelines. Defeating the boss in the final level 90 timeline spawns the first Harbinger. : They change tactics and gain new abilities
: Complete all five phases without allowing a single sacrifice. World of Warcraft: The Harbinger Questline The HarbingerHD
: Complete a master-level Hunt without any team deaths.
: Stay mobile to avoid high-damage area-of-effect (AoE) attacks and missiles.