Pohjankonna
Gargantuan monstrosity, neutral evil
Armor Class 22 (Natural Armor)
Hit Points 310 (20d20 + 100)
Speed 40 ft., jump 80 ft.
STR 26 (+8) · DEX 10 (+0) · CON 20 (+5) · INT 8 (−1) · WIS 14 (+2) · CHA 18 (+4)
Saving Throws Str +14, Con +11, Wis +8, Cha +10
Skills Perception +8
Damage Immunities Poison; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Condition Immunities Charmed, Frightened, Poisoned
Senses Darkvision 120 ft., passive Perception 18
Languages Understands Abyssal and Common but can't speak
Challenge 15
Traits
Impenetrable Scales. The Pohjankonna's scales are incredibly tough. It has resistance to damage from magical weapons and immunity to damage from nonmagical weapons.
Enthralling Gaze. When a creature that can see the Pohjankonna's eyes starts its turn within 120 feet of the Pohjankonna, the Pohjankonna can force it to make a DC 18 Wisdom saving throw if the Pohjankonna isn't incapacitated and can see the creature. If the saving throw fails by 5 or more, the creature is stunned until the end of its next turn. If the saving throw fails by less than 5, the creature is charmed for 1 minute. While charmed, the creature is compelled to use its movement to approach the Pohjankonna in the most direct way, avoiding obvious hazards. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the Pohjankonna's Enthralling Gaze for the next 24 hours.
Colossal Leap. The Pohjankonna's long legs allow it to make massive leaps. Its long jump is up to 80 feet and its high jump is up to 40 feet, with or without a running start.
Legendary Resistance (3/Day). If the Pohjankonna fails a saving throw, it can choose to succeed instead.
Actions
Multiattack. The Pohjankonna makes two attacks: one with its Bite and one with its Tail.
Bite. Melee Weapon Attack: +14 to hit, reach 15 ft., one target.
Hit: 26 (4d8 + 8) piercing damage. If the target is a Large or smaller creature, it must succeed on a DC 20 Dexterity saving throw or be swallowed by the Pohjankonna. A swallowed creature is blinded and restrained, has total cover against attacks and other effects outside the Pohjankonna, and takes 21 (6d6) acid damage at the start of each of the Pohjankonna's turns.
If the Pohjankonna takes 30 damage or more on a single turn from a creature inside it, the Pohjankonna must succeed on a DC 18 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 Pohjankonna. If the Pohjankonna dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 15 feet of movement, exiting prone.
Tail. Melee Weapon Attack: +14 to hit, reach 20 ft., one target.
Hit: 23 (4d6 + 8) bludgeoning damage. The target must succeed on a DC 20 Strength saving throw or be knocked prone.
Crushing Leap. If the Pohjankonna jumps at least 20 feet as part of its movement, it can then use this action to land in a space containing one or more creatures. Each of those creatures must succeed on a DC 20 Dexterity saving throw or take 35 (10d6) bludgeoning damage and be knocked prone. On a successful save, the creature takes half as much damage and isn't knocked prone.
Legendary Actions
The Pohjankonna 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 Pohjankonna regains spent legendary actions at the start of its turn.
Tail Attack. The Pohjankonna makes one Tail attack.
Gaze (Costs 2 Actions). The Pohjankonna uses its Enthralling Gaze on one creature it can see within 120 feet.
Underworld Breath (Costs 3 Actions). The Pohjankonna exhales a noxious cloud in a 60-foot cone. Each creature in that area must make a DC 18 Constitution saving throw. On a failed save, a creature takes 36 (8d8) necrotic damage and is poisoned for 1 minute. On a successful save, the creature takes half as much damage and isn't poisoned. A poisoned creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Lore
A northern dragon with a bull’s body, frog-like legs, and a long serpent tail.
Pohjankonna (Finnish: Pohjakonn) is a mythological creature associated with the underworld. The name "Pohjankonna" can be translated as "toad of the underworld," where "pohja" means "bottom" or "underworld," and "konna" means "toad."
The Pohjankonna is depicted as a gigantic mythical creature, often portrayed as an enormous dragon with an unusual appearance. Specifically, this dragon is described as having the body of a bull, the legs of a toad, and a long serpentine tail.
From The Witchwood Bestiary 5E, p. 78 · Fern Flower Press