These attacks also have a poisonous side effect, which reduces the player's health, regardless of the current amount, to 12. Its headbutt attack is quite powerful, and can send the player flying quite a distance - or result in instant death if they should happen to be pinned against a wall. When fighting the Guardian, be sure to keep a good distance away from it. The Guardian will never perform a running charge inside the cave (see 'Behind the scenes' below for details). However, when fought on the surface in the chapter Freeman Pontifex, the Guardian doesn't have its neurotoxin effect. Guardians have basically the same capabilities as an Antlion Guard, but with the added effect of a deadly neurotoxin somewhat like that of the Poison Headcrab. The Guardian also has a very different coloration, consisting of more varied and contrasting colors. Also notable is the Guardian's natural bioluminescence, which is presumably caused by it living in deeper darkness. Comparatively, the Guard will work closer to the surface, protecting nest entrances, and offering backup for workers. It is notable that the Guardian is very similar to the Guard, both in name and appearance, but there are numerous differences: the Guardian often lives deeper within the nests, protecting and ruling over the Antlions and eggs within. Should someone enter the 'Nectarium' for larval extract, the Guardian will attack and may pursue the thieves for some distance (in Episode Two, a Guardian follows Gordon Freeman (whose Vortigaunt companion had taken the extract outside) and battles him). Guardians are extremely protective of Antlion Grubs, the extract of which is used by Vortigaunts to manipulate the Vortessence, and will ferociously attack intruders in order to protect them. The Guardian patrols the 'Nectarium' (center of the nest), keeping watch for nest raiders. Antlion Guardians appear physically identical to Antlion Guards, but have a different coloration and are capable of bioluminescence.ДЄpparently, each Antlion hive has one Guardian that lurks near the larval clusters.

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