Pseudodragons are the size and weight of a large housecat, though with their tail they are closer to 3 feet long, and possess a similar wingspan. Your size is Tiny. As a tiny creature, you interact with the world differently then your larger peers. You have the following rules: You take up a space of 1' cube; you may move thpugh the space of size medium or larger creatures, and vise versa, though this movment is still counted as difficult terrain. You have advantage on climbing checks, but disadvantage on all other streangth checks. Finally you cannot wield normal weapons.

Accustomed to life underground, you have superior vision in dark and dim conditions. You can see in dim light withing 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of grey

You can telepathically communicate common and draconic

Your Dexterity score increases by 2, your Streangth score decreases by 2, and one other ability score of your choice increases by 1

With your mottled scales and small size, you are naturally adept at sneaking. You gain proficiency in stealth

You are proficient with perception checks

You possess a vicious bit that you may use in combat. When using your bite your unarmed strikes deal 1d4 peircing damage, and count as a finesse weapon.

You may make an attack with venomous barb on your tail. On hit, the target takes 2d8 poison damage and must make a constitution save (Save DC=8 + your constitution modifier + your proficiency bonus) or be poisoned inril the end of your next turn. Once you have successfully used this ability you may not use it again until you complete a long rest.

Once per short rest, you may use your reaction to gain advantage on a save against a spell or magical ability.