ai_addon_builder

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ai_addon_builder is a point entity available in all Source games since <Alien Swarm> Alien Swarm. This entity was part of the "Directed Design Experiments" performed at Valve in November 2007, and is the base of a modular AI system, wherein enemies could collect upgrade chips to gain new abilities and drop them when dead, allowing other enemies to collect and reuse them. This code has never been released to the public or used in its entirety in a Valve title. A related keyvalue called addon was defined in CBaseEntity, and a related input called CreateAddon was defined in CAI_BaseNPC.
Confirm:It might have been CBaseCombatCharacter.