Zombie Edition is a mod based on original half-life concept, but you will play as a headcrab and, what is more interesting, as a zombie. Zombies can mutate to change their characteristics into three types and every type will have at least six upgrades including using new weapons and abilities. For further information please check this mod's Official Page.
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So that's the main obkect of Zombie edition - Resonance Cascade Effect Reducer or RCER. That's what keeping aliens from appearing in this sector and that is hope for saving the BMRF and maybe all the Earth from invasion. And, no, you won't be able to destroy it.