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This entity is 
not in the  
FGD by default.
It should not be put directly in a map. 
 
entity_blocker  is a   point entity  available in all 
 Source games. This is spawned in temporarily to prevent NPCs from pathfinding into spaces like spawn points or movement targets. It's an invisible box solid to certain other objects. Some entities create this automatically in order to keep a certain area clear of things that could block their movement.
Commands
	
		| Cvar/Command | 
		Parameters or default value | 
		Descriptor | 
		Effect | 
	
		| test_entity_blocker | 
		 | 
		void
			 | 
		Test command that drops an entity blocker out in front of the player. |