Infested is the first Seasonal affix added to the game in Battle for Azeroth. The previous iteration was called Blight and had a different functionality.
Damage and healing done increased when injured, and reduced when healthy.
Blizzard, however, decided to go with a different variation later on in the Beta.
Some non-boss enemies have been infested with a Spawn of G’huun.
The first Seasonal affix in WoW is inspired by the final boss of Uldir, Battle for Azeroth’s first raid, so we assume it will rotate out with the release of a new raid.
How Infested Works
Themed after Blood God G’huun, Infested is the fourth affix that will activate in Mythic 10+ runs in the coming expansion. It will be always active and isn’t affected by the standard affix rotation that we’re used to since the introduction of Mythic+ dungeons in Legion.
From the description it is unclear what the Spawn of G’huun does, so we dug deep into the game files and found the following spells associated with the Spawn of G’huun:
Symbiote of G’huun – The Symbiote of G’huun has infested the target, causing it to apply Regenerative Blood to nearby allies, healing them for 10% of their maximum health every 3 sec.
Regenerative Blood – Regenerative Blood heals for 10% of max health every 3 sec.
Infest – The Spawn of G’huun attempts to Infest its nearest ally, applying Symbiote of G’huun to the target.
As stated in the description, some non-boss enemies will be infested with a Spawn of G’huun. The infestation is indicated by the Symbiote of G’huun buff and a decaying aura emanating from them. The infested mob will heal nearby targets for 10% of their maximum health every 3 seconds (Regenerative Blood) and to counter this, it’s probably the best idea to apply crowd control to the infested target and separate the pack away from it and kill it last. After the infested NPC is dead, it will release Spawns of G’huun that wlll attempt to Infest (1 sec cast time) their nearest ally and the circle continues.
Spawn of G’huun Model
Spawns of G’huun need to be killed before they find a new host.
For reference, here’s a Siege of Boralus Keystone +10 run uploaded by Bué2, showing off the affix: