You have developed traits similar to those possessed by a wyvern, granting you the following benefits:

Ability Score Improvement. Increase your Strength or Constitution by 1, to a maximum of 20.

Wyvern's Wings. As a bonus action, you can transform your arms into wings until you dismiss them (no action required). While your arms are transformed, you gain a flying speed equal to your walking speed, but your hands aren't free so you can't hold anything and you can't cast spells that require somatic components.

Wyvern's Sting. When you hit a creature with a melee weapon attack that deals piercing damage, you can force the target to make a DC 15 Constitution saving throw. On a failed save, the target takes 4d6 poison damage, or half as much on a successful one. This damage increase by 1d6 when you reach 9th level (5d6), 13th level (6d6), and 17th level (7d6). Once you use this feature, you can't use it again until you finish a long rest. Starting at 11th level, you regain all expended uses when you finish a short or long rest.