Natural Camouflage. The feathered tyrannosaurus rex has advantage on Dexterity (Stealth) checks made to hide in both Jungle and Forest terrain.

Keen Smell. The feathered tyrannosaurus rex has advantage on Wisdom (Perception) checks that rely on smell.

Siege Monster. The feathered tyrannosaurus rex deals double damage to objects and structures.

Combative Mount. A trained dinosaur is proficient with light, medium, and heavy armor.

Multiattack. The tyrannosaurus rex makes two attacks: one with its bite and one with its tail. It can't make both attacks against the same target.

Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 33 (4d12 + 7) piercing damage. If the target is a Medium or smaller creature, it is grappled (escape DC 16). Until this grapple ends, the target is restrained, and the tyrannosaurus rex can't bite another target.

Tail Swipe. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 20 (3d8 + 7) bludgeoning damage. If the target is a creature, it must succeed on a DC 15 Strength saving throw or be knocked prone and pushed 5 ft away.

Terrifying Roar (Recharge 5-6). Each time the tyrannosaurus rex roars each creature within 120 feet and able to hear the roar must make a saving throw. Each creature that fails a DC 14 Wisdom saving throw is frightened for 1 minute. A Frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.