World of Tor: A New World
Enrage. When the Hoarfrost Serenas' HP drops below 79 (3/4) it immediately becomes enraged. When the hoarfrost Serenas' HP drops below 27 (1/4) its enrage ends, as it becomes too physically weak to maintain. While Enraged, its melee attacks deal an additional 2 (1d4) cold damage, and creatures that end their turns within 5 feet of the Hoarfrost Serenas take 2 (1d4) cold damage.
Flyby. The Hoarfrost Serenas does not provoke an opportunity attack when it flies out of an enemy's reach.
Multiattack. The Hoarfrost Serenas makes two attacks: one with its beak and one with its talons.
Beak. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 4) piercing damage.
Talons. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 4) slashing damage, and the target is grappled (escape DC 15). Until this grapple ends, the target is restrained, and the Hoarfrost Serenas can't use its talons on another target.
Hoarfrost Winds. While Enraged, the Hoarfrost Serenas may use this bonus action. The Hoarfrost Serenas furiously flaps its wings, causing biting frost to lash out at each target within 15 feet of it. Each target within range must make a DC 12 constitution saving throw. Targets take 8 (2d6 +2) Cold Damage on a failed save, and half as much on a successful one.
Serenas, and their stronger relatives, Hoarfrost Serenas tend to use their agility to quickly snatch prey. Once captured they will tear away at their prey and fly to a point suitable for dropping. Once high enough, the Serenas will simply allow gravity to do most of their work, reaping the rewards shortly after.
Arctic, Mountanas, and/or craggy environments are best suited to Hoarfrost Serenas as well as their weaker cousins, Serenas. This is due to their natural affinities for colder environments, and their general strategy for dealing with grounded prey, dropping them from up high to kill them with little effort.