Undead Tyrannosaurus (Improved)

Disgorge Zombie (Recharge 5-6). As a bonus action, the tyrannosaurus zombie can disgorge 1d4 normal zombie, which appears in an unoccupied space within 10 feet of it. The disgorged zombie acts on its own initiative count. When the tyrannosaurus zombie dies, 2d6 normal zombie erupt from its corpse at the start of its next turn. These zombie act on their own initiative count.

Turn Resistance. The tyrannosaurus zombie has advantage on saving throws against any effect that Turns Undead.

Undead Fortitude. If damage reduces the tyrannosaurus zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Multiattack. The undead tyrannosaurus uses its Frightful Presence. It then 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: +13 to hit, reach 10 ft., one target. Hit: 35 (4d12 + 9) piercing damage plus 10 (3d6) necrotic damage. If the target is a Medium or smaller creature, it is grappled (escape DC 17). Until this grapple ends, the target is restrained and the tyrannosaurus zombie can’t bite another target or disgorge zombies.

Tail. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 22 (3d8 + 9) bludgeoning damage.

Frightful Presence. Each creature of the undead tyrannosaurus's choice that is within 60 feet of the undead tyrannosaurus and aware of it must succeed on a DC 12 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the undead tyrannosaurus's Frightful Presence for the next 24 hours.