Huh. While testing the T Rexes, I have found what they can do againts the roster of megabeasts.
T-rex vs. Ursa. Five on Five. Ursa lose, but not without taking down a t-rex. All t-rexes are injured, at least one of which was crippled with a spinal injury.
T-rex vs. Roc. Two rounds of five-on-five. Rocs win both times, without any losses, or
injurys for that matter.
Obviusly, a T-rex is mearly a grounded roc with teeth. And smaller claws.
T-rex vs. Elephant:five on five. Rexes win without much issue.
T-rex vs. Unarmed Alliosaur: Five on five. T-rexes win, but lose one member to a ripped throat a few seconed after the last alliosaur is killed. Looking at the CR shows that to have been a very lucky attack. Do over has T-rex winning.
T-rex vs. Hydra. Hydra is simply too big for it too actualy kill with one attack, and goes on knawing at it for a good few minutes until the rex dies after having a arm bitten off, and giving in to pain. Which then lets the hydra cherry tap it in return, exept it does it with seven heads. Same thing with Five-on five.
T-rex vs. Dragon. Again, a mit hard for the rex to compet with. Gets burnt to a crisp if there is more than one dragon, but even then is going to bleed out even if its five vs. one.
T-rex vs. Trojon: Tie. The rex gets nearly everything broken and the Trojon becomes utterly smashed to pieces, but the bite is too weak to actualy kill it. Five on five shows the same results.
Ursa major pony: Much like the Roc, these guy overpower the poor creatures for some reason. They are bigger than ursas, and they can overpower there namesake,so I guess we can chalk it up to the shear power of a hoof the size of a small house.