This article relates to the game "Half-Life: Alyx". Click here for more information.
This article relates to the workshop tools for "Half-Life: Alyx". Click here for more information.
This article's documentation is for Source 2. Click here for more information.

Runner Headcrab

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This tutorial will teach you how to add a runner headcrab or "Lightning Dog" to the map, and allow the runner headcrab to revive zombies.


Create a test room. Insert a npc_headcrab_runner

HLA SDK Runner Headcrab Img1.png

Create a Navigation Mesh. The Runner Headcrab should now be able to walk around.

Reviving Zombies

In order to allow it to revive entities you have to enable NPC Properties > Can Be Revived on each npc_zombie (hlvr) that will be able to be revived. You can also use Reviver Group in order to specify which runner headcrab can revive which zombies.

Finishing up

Compile and run your map, and you should have a working Runner Headcrab along with zombies that can be revived.