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  3. Chapter 18. Nihilanth [Xen] | Half-life: Black Mesa

Chapter 18. Nihilanth [Xen] | Half-life: Black Mesa

Posted on August 6, 2026August 26, 2026 by alienshooter

We find ourselves in a large hall, with a huge boss, Nihilanth, hovering in the center—the leader of six-armed flying monsters. The boss can attack with yellow lasers from his hands, unleashes a red firestorm, and fires slow blue projectiles. You can hide from most of his attacks behind the rocks.

Nihilanth is protected by a force field, so first, we destroy the blue crystals above, left, and right. They have several layers of shields; we can use missiles or the Gluon Cannon. It’s best to disable automatic missile guidance, otherwise the boss will redirect them.

We can attack the boss through the broken windows. However, Nihilanth will begin to regenerate health from three yellow crystals emerging from the ground; we need to destroy them.

When the boss runs out of crystals, he’ll start spinning, his head will open, and inside you’ll see the main yellow crystal. Dodge the waves of fire and shoot at the crystal in his head until it explodes. All that’s left is to make a choice, and the game is over.

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