Thanks to your life in the murky depths, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light.

You have resistance to cold damage.

Your Constitution score increases by 1, and your  Intelligence score increases by 2.

You can speak, read, and write Common and Deep Speech.

 Cephalafolk mature at the same rate humans do and reach adulthood around the age of 20. They live considerably longer than humans, though, often reaching well over 100 years.

Most cephalafolk are varying degrees neutral, living in close harmony with nature believing that just like nature in nature life is chaotic and unpredictably.   

Cephalafolk are significantly taller than most humans, standing between seven and eight feet tall and averaging about 300 pounds. Your size is Medium.

Your base walking speed is 20 feet. 

You have a swimming speed of 30 feet.

You can breathe air and water.

The Cephalafolk has advantage on Dexterity (Stealth) checks made while underwater.

You lash out with one of your many tentacle (1d6+ str modifier) bludgeoning damage and the target is grappled (escape DC Dex save 13). Until this grapple ends, the creature is restrained, and the cephalafolk can't use its tentacles on another target.

Once per short rest you expel ink in a 20- foot-radius cloud of ink extends all around the octopus if it is underwater. The area is heavily obscured for 1 minute, although a significant current can disperse the ink. After releasing the ink, the cephalafolk can use the Dash action as a bonus action afterwards.

Once per short rest as a reaction if on land, you take the attack action to forcefully expel ink in a 10ft line dealing 1d4 force damage if the target has eyes, the ink heavily obscures the targets vision, the cephalafolk can use the Dash action as a bonus action afterwards.

You have disadvantage on attack rolls and on Perception checks that rely on sight when you, your target, or whatever you are trying to perceive is in direct sunlight.