Stymphalian Bird (5e Creature)
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Large monstrosity, neutral evil
Skills Perception + 5, Stealth + 3
Dive Attack. If the bird 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 7 (2d6) damage and the target must make a DC 13 Strength saving throw or be knocked prone.
Flyby. The bird doesn't provoke opportunity attacks if it flies out of an enemy's reach.
Rampage. When the bird reduces a creature to 0 hit points, with a melee attack on its turn, the bird can take a bonus action to move up to half its and make a melee attack.
Sharpened Feather Regrowth. The bird has thirty sharpened feathers. Used feathers regrow when the bird finishes a long rest.
Multiattack. The bird makes two attacks: two with its beak or one with its beak and one with its talons.
Beak. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: X (2d6 + 4) piercing damage. If the target is a creature and not a construct or undead, it is considered bleeding until the end of the bird's 4th turn. While bleeding, the target loses (1d4 halved) hit points at the start of each of the bird's turns.
Talons. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: X (2d8 + 4) slashing damage, and the target is grappled (escape DC 15). Until the grapple ends, the target is restrained, and the bird can't use its talons on another target.
Sharpened Feathers. Ranged Weapon Attack: +5 to hit, 60/120 ft., one target. Hit: X (1d8 + 4) piercing damage.
Drop. If a Medium or smaller object or creature grappled by the bird, it can drop it from the sky and knock it prone. If the target dropped strikes a solid surface, the target takes 5 (1d8) bludgeoning damage for every 10 feet it falls (to a max of 6d8). If the target is dropped at another creature, that creature must succeed a DC 15 Dexterity saving throw or take the same damage and be knocked prone.
Bringing chaos wherever it is they go, Stymphalian birds are great avian predators with talons as long as short swords, beaks that shine like bronze, and feathers that come to sharpened metal points. These birds have feathers the color of bronze, dung that is noxious enough to kill a normal man and make their nests in desolate, rancid swamps.
Avian Hunters. Stymphalian birds live in massive communal flocks, flying out from the swamps only to hunt or migrate. They will eat just about any creature they can kill, but they have a particular fondness for human flesh. When humans are seen, the birds immediately go into a flurry of screeches and flying feathers and are quick to mercilessly descend upon the unlucky group.
Homebody Hawks. The communal nests of stymphalian birds are hectic and loud with commotion. The mating seasons are quite chaotic, as males just mate with whatever females are around with no regard for formalities. The biggest and strongest male mates with the most females, but as the males protect the colony but take no part in parental care, never form any relationships with those females, and may copulate with females already mated, females almost always stay with fledglings. A unique trait of stymphalian birds is that a single male only can fertilize a single egg within the female, so a broad of seven eggs are from seven different fathers.