Medium Dragon, unaligned
Armor Class: 14(natural armos)
Hit Points: 26(4d8 +8)
Speed: 30 ft., Climb 30 ft., Fly 60ft
STR: 13 (+1)
DEX: 14 (+2)
CON: 14 (+2)
INT: 5 (-3)
WIS: 14 (+2)
CHA: 7 (-3)
Skills: Perception: +4
Damage Immunities: acid, poison
Senses: darkvision 60ft., passive Perception 14
Challenge: 3 (700xp)
Multiattack. The wyvern makes two attacks: one with its bite and one with its stinger. While flying, it can use its claws in place of one other attack.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 5 (1d6 + 1) piercing damage plus 3 (1d6) acid damage.
Claws. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 1) slashing damage
Stinger. Melee Weapon Attack: +4 to hit, reach 10 ft., one target. Hit: 5 (1d6 + 1) piercing damage. The target must make a DC 13 Constitution saving throw, taking 11 (3d6) poison damage on a failed save, or half as much on a successful one.
Miasmic Breath(Recharge 6). The wyvern makes a breath weapon attack in a 30ft line in front of it. Targets must make a DC 13 Dexterity Save or take 11 (3d6) acid damage on a failed save or half as much on a successful one.