1 Get a friend

2 make a 4 by 4 taming pen from wooden pillard

3 aggro the rex

4 draw it in to the pen ( yell your friend to keep distance it has a big aggro range even with ghillie )

5 tell your friend to close the pen

6 tranq it

Its a really easy tame make sure to have 115% movement speed and you got your own rex

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