Yutyrannus (5e Creature)
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Large beast, unaligned
Snow Camouflage. The yutyrannus has advantage on Dexterity (Stealth) checks made to hide in snowy terrain.
Pounce. If the yutyrannus moves at least 30 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 13 Strength saving throw or be knocked prone. If the target is prone, the yutyrannus can make one bite attack against it as a bonus action.
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 15 (2d10 + 4) piercing damage.
Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 4 (1d8 + 4) slashing damage.
The yutyrannus is a predator of similar size and build to allosaurus, but is actually closer in relation to tyrannosaurus rex. It is covered in feathers all the way down to its toes, well suited for the cold environments they inhabit.