Hives (ハイブ Haibu) are variants of the Mulligan with a large rotting head inhabited by flies. They're fairly harmless but will spit out flies on occasion and release more on death. Hives are considered to be a weaker version of The Duke of Flies as they both spit out flies and do not directly attack the player.
Hives appear to be more repulsive than regular Mulligans with their head looking rotted and missing one of their eyes.
They act similar to Mulligans and Mulligoons, as they try to flee from the player. This frequently makes them run into dead ends or fireplaces. However, do not be fooled by their passive behavior; they will vomit flies if Isaac is in their line of sight. On death, they will spawn up to five Attack Flies, Large Attack Flies, or Pooters. Unlike Mulligans and Mulligoons, Hives do not randomly explode.
The Hive's behavior gives the player the possibility to drive the Hives into edges or dead ends. If they are driven into corners or obstacles, it becomes much easier to kill them. They tend to vomit flies as Isaac are shooting at them, though, so be careful about that.
It is not recommended to charge tears if the player has picked up Chocolate Milk. Charge shots will likely hit any flies a Hive has just vomited up as a last-ditch effort, thereby wasting the time it took to charge the shot.
Eternal Champion Behavior
Eternal Normal Variant
Eternal Miniboss Variant
There's also one Miniboss version of Eternal Hive. It appears larger than Eternal Hive, has 2 Eternal Flies surrounding itself, and vomits Eternal Flies while running away from Isaac. It explodes into several Eternal Flies and Spiders on death, and will always drop an Eternal Heart.
- They appear in the original game.
- The Gaper, Mulligan, Hive and Swarmer are all the same monster in stages of decay and infestation. The Hive seems to be in the moderate stages of decay and infestation.