You are around 3 foot tall to 4 foot tall. Your size is Small.

You can scurry about similar to your ancestors. If your hands are free, you can drop down on all fours and increase your movement speed to 35 ft. You must use half your movement speed to stand back up.

You can observe 60 ft in darkness as if it were daylight. You are unable to discern colour.

You have the peculiar ability to get through spaces much smaller than yourself. You can move through spaces that are considered Tiny.

You've got a keen sense of smell. Even though the most horrid smells surround you, you can make out the aromas of the things you seek. This gives you an advantage on any checks that involve scent!

Living in sewers and squalor has given your kind a benefit immunity to things that might kill others. You are immune to most diseases and illnesses, as you likely carry some yourself. You are also resistant towards poisons, not that people haven't tried, and lastly, you are more than used to eating food that has rotted and purified. As a consequence, your kind has a high metabolism and must consume the same amount of food as someone bigger than you.

You're used to taking advantage of your surroundings, making you proficient in improvised weaponry.

Your brain still has some primal instincts leftover from your ancestors, and when frightened you revert to that primitive mindset. After a failed Stealth check, your next two actions will have Disadvantage!

Being both beast and man, you can speak to both. You know how to read, write, and speak Common, Beast Speak, and one other language of your choice!

You're a sneaky rat and therefore you are naturally stealthy.

You gain +2 on Dexterity score, and +1 on Constitution