Dododex
ARK: Survival Evolved & Ascended Companion

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A tek rex snuck up on me while I was trying to find a safe way to tame a tek stego -- honestly, taming the rex instead was an excellent idea.
She was only a level two when I tamed her and gained no levels (I had no prime) but she was easily tearing apart trikes and other tough creatures on the way back to my base without facing hardly any damage. Keep in mind, she was only level two!
I had never tamed a rex before, but I don't at all regret it -- I can 100% see why they're so popular. They make excellent tanks for any kind of fight, and are fun if you (like me) just feel like running around and murdering everything that moves.
My only issue is the stamina consumption. I would suggest not running -- it drains stamina in mere seconds and isn't much faster than the walk, as far as I can tell. I'm upgrading her stamina but it'll take a lot to combat the stamina consumption.
I've only had her for a short period of time, but I already love her!