Ropen (5e Creature)
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Large beast, unaligned
Dive Attack. If the ropen is flying and dives at least 30 feet straight toward a target and hits it with a melee weapon attack, the attack deals an extra 5 (2d8) damage and the target must make a DC 15 Strength saving throw or be knocked prone.
Flyby. The ropen doesn't provoke an opportunity attack when it flies out of an enemy's reach.
Iron Stomach. The ropen has advantage on saving throws against disease.
Multiattack. The ropen makes two bite attacks against a target it is grappling, or one bite attack and two claw attacks.
Bite. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 9 (2d10 + 3) piercing damage, and the target is grappled (escape DC 15). Until this grapple ends, the target is restrained, and the ropen can't bite another target.
Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (2d8 + 3) slashing damage. The ropen may substitute doing damage for grappling the target, but can only grapple a single target and cannot use its claws to attack until the grapple ends. While grappling a creature of Medium or Large size, the ropen's flight speed is halved.
Unbridled Fury. In response to being hit by a melee attack, the ropen can make one melee weapon attack with advantage against the attacker.
The Ropen is a large, peculiar pterosaur found in jungle islands that tend to be isolated from the world. These large predators tend are generally known to keep to themselves, only seen by natives due to their most odd trait: ropens are bioluminescent, producing a cyan or turquoise glow from their underbellies and from markings. For those lucky, or unlucky, enough to see one up close, they are described as large, rhamphorhynchid pterosaurs, with jagged teeth, a large, flat crest on the back of the head, and a long tail that ends in a paddle shape. However, descriptions have varied, as some describe it as being more similar to an ornithocheirid or a pterandontid. Ropens are primarily piscivorous, feeding mostly on fish, their lights are often seen gliding above the waves and disappearing into the inky depths, and reappearing with a fish glimmering in the moonlight. They tend to live in isolated caves, far away from any humanoids that would disturb them. However, islands that are populated by ropens are no strangers to reports of grave robberies with half-eaten corpses, hinting at a scavaging behavior among them. And farmers have also reported hearing their livestock being carried off into the night by something they don't want to see.