A 5e conversion of a Pathfinder monster. Its on the random encounter charts for the Valley of the Brain Collectors. I thought a flock of these attacking the parties tank would have made for a cool set-piece. But I never got around to fitting them in.
Armour Class 18 (natural armor)
Hit Points 152 (16d10 + 64)
Speed 40ft., burrow 20ft.,
STR 21 (+5) DEX 10 (+0) CON 19 (+4)
INT 14 (+2) WIS 13 (+1) CHA 17 (+3)
Saving Throws Dex +4, Con +8, Wis +5, Cha +7
Skills Perception +9, Stealth +4
Damage Immunities acid
Senses blindsight 30ft., darkvision 120ft., passive Perception 19
Languages Common, Draconic
Challenge 9 (5,000 XP)
Savage Bite. A rift drake applies 1-1/2 times its Strength bonus to damage dealt with its bite attack, and it threatens a critical hit on a 19–20.
Multiattack. The rift drake makes three attacks: one with its bite and two with its tail.
Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target.
Hit: 18 (2d10 +7) piercing damage plus 5 (1d10) acid damage.
Tail Slap. Melee Weapon Attack: +9 to hit, reach 5 ft., one target.
Hit: 12 (2d6 +5) bludgeoning damage. If the target is Medium size or smaller, it must succeed on a DC 16 Strength saving throw or be knocked prone.
Clinging Corrosion (Recharge 5-6). The rift drake spit a ball of caustic gas that bursts into a cloud upon impact. In a 60-foot cone. Each creature in that line must make a DC 16 Dexterity saving throw, taking 55 (10d10) acid damage on a failed save, or half as much damage on a successful one. Any creature failing its saving throw is also slowed as the spell for 1 minute.
Speed Surge. As a reaction, a rift drake can draw on its draconic heritage for a boost of strength and speed that allows it to take an additional move action that round in response to being hit. This does not provoke an attack of opportunity.
Horns jut from this muscular dragon’s beaked head, and spikes cover the dragon’s hide even in places on its winged arms.