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This article contains information from the Warcraft RPG which is considered non-canon.

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Grappling hooks are fine for simple climbing, but sometimes you need to move heavy loads over walls or across chasms. The pulley gun makes this job a breeze. A blast of steam propels a thick metal spike up to 50 feet through the air and deep into any stone surface. The force of impact compresses the spike, causing four tines to dig into the surface and secure it.[1]