Amphibious. The giant flying manta ray sea monster can breathe air and water.
Siege Monster. The giant flying manta ray sea monster deals double damage to objects and structures.
Multiattack. The giant flying manta ray sea monster makes two attacks: one with its bite and one with its sting.
Sting. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 12 (2d6 + 5) piercing damage. The target must succeed on a DC 14 Constitution saving throw or be paralyzed until the end of its next turn.
Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) bludgeoning damage and the target is grappled (escape DC 16). Until this grapple ends, the target is restrained, and the giant flying manta ray sea monster can’t bite another target.
Swallow. The giant flying manta ray sea monster makes one bite attack against a Large or smaller creature it is grappling. If the attack hits, the target is also swallowed, and the grapple ends. While swallowed, the target is blinded and restrained, it has total cover against attacks and other effects outside the giant flying manta ray sea monster, and it takes 21 (6d6) acid damage at the start of each of the giant flying manta ray sea monster's turns.
If the giant flying manta ray sea monster takes 30 damage or more on a single turn from a creature inside it, the giant flying manta ray sea monster must succeed on a DC 14 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the giant flying manta ray sea monster. If the giant flying manta ray sea monster dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 20 feet of movement, exiting prone.
Thunderous Roar (Recharge 5–6). The giant flying manta ray sea monster releases a mighty roar in a 60-foot cone. Each creature in that area must make a DC 16 Dexterity saving throw. On a failure, a creature takes 42 (12d6) thunder damage and is deafened until the end of its next turn. On a success, a creature takes half the damage and isn’t deafened.
The giant flying manta ray sea monster can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature’s turn. The giant flying manta ray sea monster regains spent legendary actions at the start of its turn.
Move. The giant flying manta ray sea monster moves up to half its speed without provoking opportunity attacks.
Sting (Costs 2 Actions). The giant flying manta ray sea monster makes one sting attack.
Tail Sweep (Costs 2 Actions). Each creature within 10 feet of the giant flying manta ray sea monster must succeed on a DC 16 Dexterity saving throw or be knocked prone.
Swallow (Costs 3 Actions). The giant flying manta ray sea monster uses its Swallow.
Description
This monster was created by the panelists (Shawn Merwin, Meagan Maricle, and Adam Bradford) and attendees of the Monster Design seminar at GameHole Con 2018. Compiled and edited by Meagan Maricle.
Whale Eater. The giant flying manta ray sea monster hunts whales using its thunderous power to interrupt echolocation and whalesong. It hunts along whale migration routes and picks off whales scattered by its call.
Whaler’s Bane. The giant flying manta ray sea monster occasionally mistakes ships for whales and will attack whaling vessels also hunting migrating whales. The taste of humanoids isn’t unpleasant to the giant flying manta ray sea monster, which will sometimes fly above the water and dive onto the decks of such ships to slurp up the tasty sailors.
Weakness: Harpoons. The giant flying manta ray sea monster's blubbery body provides it some protection against most weapons, but the harpoons of whaling ships are particularly effective at penetrating its tough hide. Many giant flying manta ray sea monsters that have survived encounters with whaling ships now hunt those ships just as often as whales to rid their territories of the dangerous harpoons.
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