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Pheropod
From HalfLife 2 Knowledge Base
- slight spoiler*
The pheropod "weapon" is obtained after killing the large antlion in "Sandtrap", where the Vortigaunt retrieves it for you.
After you have this weapon, it will let you control the once hostile antlions. Pressing the primary fire button will throw a pheropod, and any antlions near by will go to where you have thrown it and attack whatever might be there. Pressing the secondary fire button causes you to squeeze the pheropod and causes any antlions near you to come to your location.
Once you have the pheropod, it will not run out.

