Bone crawler are a mutant strain of Zerg made to double as anti-personnel weapons. At first glance, they appear as a cross between centipedes, snakes, and Terran spinal columns. Each segment contains multiple worm-like organisms holding each other together with the same muscle strength as a Hydralisk (Halo: Lekgolo). Alone, Bone crawlers are ferocious as Zerglings. When bonded to a host, they become several times more deadly. If anyone but the one bonded to the Bone crawler tries to use them, they are impaled with several hidden toxic spines (Marvel: Blade).