The Catacombs of Saint Martens

Zombie Adult Dragon

HP 81 (6d12+42) AC 19, Speed 40 ft., climb 40 ft., fly 60 ft.

STR 27 (+8), DEX 10 (+0), CON 25 (+7), INT 6 (-2), WIS 13 (+1), CHA 10 (+0)

Vulnerabilities Radiant

Immunities Fire

Senses Blindsight 60 ft., darkvision 120 ft.

Traits

Actions

Claw. +12 to hit, reach 10 ft., one target. Hit: 22 (4d6+8) slashing damage. The dragon can reduce the damage to 18 (4d4+8) slashing damage to grapple the target, knock it prone, or push it back 5 feet.
Bite. +12 to hit, made with advantage against a grappled target, reach 10 ft., one target. Hit: 19 (2d10+8) piercing damage, or 30 (4d10+8) piercing damage if the dragon has the target grappled.

Bonus Actions

Regenerate. The dragon regenerates 20 hit points.
Rejuvenate. The dragon repeats the saving throw against one harmful effect affecting it. (The dragon can take this bonus action even if it otherwise can't take actions or bonus actions.)
Tail. DEX DC 20, each creature within a 15-foot cone. Failure: 17 (2d8+8) bludgeoning damage and the dragon can push the creature up to 10 feet and knock it prone.

Reactions

Guard. In response to an allied creature taking damage
an enemy attacking a creature within 30 feet, forcing that creature to make a DEX saving throw against a harmful effect, or casting magic missile against that creature, the dragon moves up to its speed toward the target, becomes the target of all such attacks and effects until the start of the dragon's next turn, or until the target is no longer within the dragon's space.