My experience with trying to knock out a level 156 Rex.

I went to Carnivore island (The little island on the top right of the island map) along with 1 tribe mate. All we needed to do was run around-sometimes dodging around rocks and shooting. We had 150% speed with Journeyman xbows and we went through no more than 20 tranq arrows. Just run around turn and shoot. Make sure you keep some distance before shooting so you don’t allow time for the Rex to get you. I hope this helps! - doubah.

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