Start by crafting 4 Metal Dinosaur Gateways and Large Bear Trap. Place 3 Metal Dinosaur Gateways in an open square formation, but don't connect them, leave small spaces in the corners. Place a large bear trap in the center, and lure the Giga into it. You'll have seven seconds to run around and place the fourth Dinosaur Gateway. Now the Giga is pinned in the square, use whatever method of applying torpor you like, but I highly recommend using your best Crossbow, arrows are cheaper and a better investment than darts.

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