Frost Reservoir. A Boreal Wyvern has a specialized frost sac in its body that allows it to send forth gouts of cold. Each Boreal Wyvern can hold up to 10 frost charges, which it can spend to use certain attacks. A Boreal Wyvern always starts off with 5 frost charges at the start of an encounter. At the start of each of its turns, a Boreal Wyvern regains 3 frost charges.
Keen Hearing and Sight. The Boreal Wyvern has advantage on Wisdom(Perception) checks that rely on hearing or sight.
Snow Camouflage. The Boreal Wyvern has advantage on Dexterity(Stealth) checks to hide in snowy terrain.
Multiattack. The Boreal Wyvern makes two attacks, one with its bite and one with its stinger. If it has enough frost charges, the Boreal Wyvern can instead make 3 frost shot attacks.
Bite. Melee Weapon Attack: +8 to hit, reach 10 ft., one creature. Hit: 11(2d6+4) piercing damage plus 6(2d6) cold damage.
Stinger. Melee Weapon Attack: +8 to hit, reach 10 ft., one creature. Hit: 11(2d6+4) piercing damage. The target must make a DC 16 Constitution saving throw or take 24(7d6) poison damage on a failed save, or half as much damage on a successful one. In addition to this, the target is poisoned for 1 minute on a failure. Until this poison ends, the target is paralyzed. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Frost Shot(1 frost charge). Ranged Weapon Attack: +8 to hit, reach 30/120 ft., one creature. Hit: 13(3d8) cold damage and the target's speed is reduced by 10ft until the end of their next turn.
Chill Breath(5 frost charges). The Boreal Wyvern exhales a blast a chilled air in a 30-foot cone. Each creature in that area must make a DC 16 Dexterity saving throw, taking 36(8d8) cold damage on a failed save, or half as much damage on a successful one.
Boreal Blast(10 frost charges). The Boreal Wyvern targets a point that it can see within 150 feet of itself and unleashes a sphere of cold air and swirling ice from its maw at that point. Each creature in a 20-foot radius sphere on that point must make a DC 16 Dexterity saving throw. A target takes 35(10d6) cold damage on a failed save, and half as much damage on a successful save.
Description
Ferocious hunters that prowl the skies of frigid hinterlands, Boreal Wyverns strike an imposing figure as they fly through the skies of their wintry domains. Boreal Wyverns are clad in an impressive coat of feathers and down, often in shades of gray or white, insulating the reptiles and allowing them to shrug off the elements with little effort. An average Boreal Wyvern stands about 10 feet tall at the hip, standing on two muscular, raptorial legs tipped with hooked claws perfect for pinning down prey. The long, stiff tails of a Boreal Wyvern have specialized feathers on their tail that can help act as a rudder during flight, as these feathers can either be fanned out or closed. During mating season, male Boreal Wyverns fan out their tails and display the unique black markings on them to attract a mate. These Wyverns sport a thick, hooked snout designed to grab and hold prey, while the inside of their mouth is lined with serrated teeth perfect for slicing up prey. Boreal Wyverns have excellent hearing and vision, even being able to see into the infrared spectrum to spot sources of heat, making finding prey that much easier. Despite fierce appearances, Boreal Wyverns are highly social, often hunting in groups of three and sharing the spoils of a kill. The most dangerous part of a Boreal Wyvern, however, isn't their beaks or talons, but the specialized frost sac in their bodies that produces a cryogenic gas. This gas can be expelled in a number of ways, often used by these reptiles to shoot forth bursts of cold that slow a target, cones of frost that freeze all in their wake, or levying a huge burst of concentrated cold in a sphere of swirling frost that chills even the staunchest of creatures. This same frost sac also uses its gas compound to mix with the poison in the barbed stinger hidden in a Boreal Wyvern's tail, and this venom makes any unfortunate target feel as if they've been frozen stiff, paralyzed and helpless to protect themselves from further attack.
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