You are a Beast

You are Medium or Small. You choose the size when you select this race.

Your walking speed is 20 feet. You have a climbing speed of 10 and a swimming speed of 35

You can squeeze through a space as narrow as 1 inch wide, provided you are wearing and carrying nothing. You have advantage on ability checks you make to initiate or escape a grapple.

With no skeleton to support weight, you count as one size smaller when determining your carrying capacity and the weight you can push, drag, or lift.

You can see in dim light within 30 feet of yourself as if it were bright light, and in darkness as if it were dim light. You discern colors in that darkness only as shades of gray.

You can travel above water normally for up to one hour.  At the end of this hour and each subsequent hour, gain one level of exhaustion. Being submerged for one minute in water removes one level of exhaustion gained in this way.

You have 8 arms, of which any number up to 6 can be used to manipulate multiple objects with one [Tooltip Not Found] action. Your tentacles have reach of 10 feet for this action. The DM may require multiple arms for delicate or heavy object manipulation.

If a tentacle is severed, it continues with it's last action for the remainder of it's existence (IE, Attacking an enemy, pulling a lever). If no action was taken, it becomes a tiny creature under the DM's control. This creature shares the same stats as a Crawling Claw.  After 1 hour, the tentacle withers away. Lost tentacles regenerate after 1 month.  A spell that recovers hit points cast at or above 3rd level can speed up regeneration by one week. The Regenerate spell instantaneously restores lost tentacles for the duration.

As an action, you can alter the coloration of your body to grant yourself advantage on stealth checks relying on sight for one minute. You can use this ability a number of times equal to your proficiency bonus per long rest.