Wyvern

Wyvern CR: 6 (2300 XP)

Large dragon, any

Armor Class: 13 (natural armor)

Hit Points: 110 ( 1d10+39 )

Speed: 20 ft , fly: 80 ft

STR

19 +4

DEX

10 +0

CON

16 +3

INT

5 -3

WIS

12 +1

CHA

6 -2

Skills: Perception +4

Senses: darkvision 60 ft.

Challenge Rating: 6 (2300 XP)

Actions

Multiattack The wyvern makes two attacks: one with its Bite and one with its Stinger. While flying, can use its Claws in place of one other attack.
Bite Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 2d6+4 piercing damage.
Claws Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 2d8+4 slashing damge.
Stinger Melee Weapon Attack: +7 to hit, reach 10 ft.., one target. Hit: 2d6+4 piercing damage and the target must make a DC 15 Constitution Saving Throw, taking 7d6 poison damage on a failed save, or half as much on a successful one.