One challenging boss that players must face in Horizon Forbidden West is the Slaughterspine, a giant Tyrannosaurus Rex-like machine with a flexible tail. Aloy will encounter this beast during the Main Quest, "GEMINI," during which she must face the Slaughterspine within a large dome-shaped arena. Players must take advantage of the open space by laying down traps whenever they gain distance from the machine boss in Horizon Forbidden West.
The battle will start with the Slaughterspine standing still while beginning to charge its Plasma attack. Players should immediately take this time to prepare by scanning the machine for weak points and setting up traps within the vicinity. The Slaughterspine are vulnerable to Purgewater damage, making Purgewater Traps very effective for battle. Additionally, frost attacks such as Freeze Arrows or firing with the Frost Blastsling are strong against this machine and can deal bonus damage once the boss is frozen. Players can also use the Chillwater Drum to freeze the Slaughterspine.
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The Slaughterspine boss isn't as tanky as a machine like Tremortusk, yet it can damage a devastating amount if players get too close, particularly with its charged Plasma attacks. While it is pulsing with Plasma, players are advised to keep their distance and gradually build up its Frost Element by firing projectiles from afar in Horizon Forbidden West. Once fully charged, it will unleash an ear-piercing roar and fire Plasma bolts within its immediate vicinity.
When the Slaughterspine closes the distance with Aloy, stop attacking instantly and dodge away. The boss has several deadly tail swipes that have a far reach despite being a close-ranged melee
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