Cinstita

Heart of the Storm. Cinstita is resistant to thunder or lightening damage. Additionally, the next time that Cinstita makes an attack that hits, then half the lightening or thunder damage that has been taken by Cinstita's attack since the end if its turn, and it is added to the attack's regular damage. This extra damage takes the same form as the initial damage type.

Multiattack. Cinstita makes three attacks: two with its beak and one with its spurs.

Beak. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 2d10 + 4 slashing damage.

Spurs. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 2d10 + 4 slashing damage. If the attack hits, the target must succeed on a DC 15 CON saving throw or else take 4d6 poison damage and be poisoned for up to 1 minute. If the target succeeds on the saving throw they take half of the damage and do not become poisoned. While poisoned, the target takes 1d8 points of poison damage at the start of each of its turns. Afflicted creatures may repeat the saving throw at the end of their turn, and on a success are cured of the poison's effect.

Guardian's Warning (1/Day). Cinstita summons a burst of thunderous force in a line that is 30 ft. long and 10 ft. wide. Each creature in that line must make a DC 14 DEX saving throw, taking 11d8 thunder damage on a failed save, or half as much damage on successful one. Cinstita can choose to use their next action to continue the attack, converting its damage type to lightening. All targets who were struck by the first attack must make another DC 14 DEX saving throw, taking 11d8 lightening damage on a failed save, or half as much damage on a successful one.