Once tamed, upgrade stamina if you chose a low level individual. Their roar takes a lot of stamina, so higher levels are recommended. If you can get a lot, you can position them surrounding your base, and they will roar at any attackers that come too close, weakening them and even scaring them off.
Packmate, I've been a Yutyrannus rider for a long time. I prefer Yutys over Rexes, as their control level is super high and they synergize well with pack creatures and apex predators alike. Their bites have crazy knockback, sending your prey over to your allies.
A Raptor pack is extremely dangerous when they stick by a Yutyrannus rider's side. Between my imprinted Raptors, their Pack Chant and the Courage Roar, my prey was killed so quickly that I legitimately forgot that they were even there for two seconds. It happens even faster when I have a five-pack of critters: three Raptors and two Allosaurs. Deinonychus work great, too!
Courage Roar adds even more damage to fantastic abilities like a Spino's Hydrated, Deinonychus' bleeding attacks and a Wyvern's breath weapon.
Lemme put it this way, packmate: Yutys are amazing for those who take the time to know their animal companions, or for Tribe cheiftains. Wild man or Tribesman, you can't go wrong with this tyrant.
This thing is an absolute beast. I tamed a level 120 and pumped nothing but stamina so it could yell at my dinos to do better when fighting the broodmother. They were so inspired, that they got a 25% damage bonus, and a 25% damage resistance bonus meaning we completely shredded the broodmother when it may have been a close fight. One or two of these behind your army and you, my friend, have comrade stalin himself telling your troops to fight to their last breath
The fear roar is amazing for taming because the damage increase reduces the amount of tranqs you would need to use to knockout something. make sure to have already caged the creature though because if you don't they will run away.
Yes yes ou can ally wild carnos to help you, but what would be better is if it could bend enemy tribe's carnos to do your bidding! Roar next to a tribe with mostly carnos and watch them break them from the inside, how evil would that be?!