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The subject matter of this article contains in-development information that was cut from the final version of an official and/or canonical source and appears in no other canonical source. It may also contain incomplete information since not all cut material is publicly known.
Described as a "living balloon" with a faintly glowing head, it is held aloft by buoyant gases trapped in its head membrane. The wing on its rear portion is fully articulated like a bat wing, tipped with poisonous spines, and serves as a sail.
It was to be seen at least on Xen, though the map files present in the Half-Life 2 leak suggest that fights between the HECU soldiers and these creatures were to take place during the On A Rail chapter.
Behavior and skills
It has feathery antennae, much like a moth (its only sensory organ), "tasting" air to look for group mates or food. Passive when not attacked, it was to use an orifice to shoot projectile at the player with gas when attacked.
In the file "bloater.cpp" in the Half-Life SDK can be found coding for melee attacks as well as sounds, using zombie sounds as placeholders.