Armor Class
13
(natural armor)
Hit Points
58
(8d10 + 14)
Speed
15 ft., fly 60 ft.
STR
16
(+3)
DEX
10
(+0)
CON
13
(+1)
INT
4
(-3)
WIS
12
(+1)
CHA
6
(-2)
Skills
Perception +3
Senses
Darkvision 60 ft., Passive Perception 14
Languages
--
Challenge
1 (200 XP)
Proficiency Bonus
+2
Actions
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 6 (1d6 + 2) piercing damage.
Claws. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 2) slashing damage.
Stinger. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 6 (1d6 + 2) piercing damage. The target must make a DC 11 Constitution saving throw, taking 14 (4d6) poison damage on a failed save, or half as much damage on a successful one.
Description
Cousins to the great dragons, wyverns have two scaly legs, leathery wings, and a sinewy tail topped with a poison stinger that can kill a creature in seconds.
You have a mistake; it seems, by the attacks, you meant the strength to be 14 or 15.
Also, this is probably more CR 2 than 1.
But still, pretty good! Gonna use it.