You have a +2 to Intelligence, and +1 to constitution

as you have 4 excess limbs, you can hold up to 4 weapons. You may hold any weapon in 1 hand if your strength score times 2 is 3 greater than the weight of the item, and in 2 hands if your strength score times 5 is 10  greater than the weight of the item if your strength score is any lower you must use at least 3 arms on that weapon. Any versatile option which is light enough to be held in one hand is an extra set size larger if you wield with 3 hands, and if you can't wield it in 1 hand then this clause applies but with 4 arms, to get the normal extra die size use 3 hands, and if you already need 3 hands to wield the weapon it loses versatile. the two-weapon fighting fighting style allows you to add your relevant ability modifier to your third and fourth weapon attacks, if applicable. Whenever you use your bonus action to attack with your offhand weapon, you may also attack with your third and fourth weapons.

You can breathe both air and water. Damage you deal with melee weapon attacks is halved.

You have the ability to camouflage with your surroundings at will. You have advantage on stealth checks while not moving.

You have strong neurotoxic venom, whenever someone makes contact with you, you may inject your venom into them. The target takes 1 piercing damage and must make a constitution save of dc 10 + half your level (minimum 1), on a failure, they take 1d4 -1 (minimum 1) poison damage and are incapacitated for 1 round. If they crit fail, or fail by 10 or more, they are also paralyzed for 1d4 rounds.

You have ink sacs, and when you are in trouble you can blind nearby attackers so that you can run away. As an action, you may spray someone, They make a dexterity saving throw. the dc is equal to 10 plus half your level rounded up, if they fail, the target is blinded for 1d4 rounds.

If you lose a limb, it will regrow over 1d8 days.