Inklings cannot swim in water, or touch it for prolonged times for that matter. If you touch any water substance, you will take 2d6 acid damage. You can of course still drink water, and have water inside your body, in a water bottle, etc.

As a bonus action on your turn, you may transform into or out of the squid form.

While in squid form, you may only use the dash action, and your AC is equal to 8 + your CON modifier. 

While in squid form, and under the "Inked" condition, you become much harder to see, and as such, attack rolls against you are made with disadvantage.

While in squid form, if you do not have the "Inked" condition, your walking speed becomes 10.

If one bonus action has already been used to transform into squid form and you are under the "Inked" condition, you may start gaining ink points without using a bonus action. Note this is only for the first turn while you do this, subsequent turns will need to use a bonus action.

Inklings have double the normal jump height of humans.

You are proficient in acrobatics and stealth checks while under the "Inked" condition and in squid form.

Grapple attacks also roll with disadvantage while under the "Inked" condition and in squid form.

You have disadvantage on any checks involving speaking Common due to you not being fluent in the language.

You start the game with an inkbrush, a common weapon of squid kids. It basically serves as a giant paintbrush (about the size of a longsword) that can be used to spread ink around or do damage.

• If you have ink to use (at least one ink point), you may take an action to attack a surface to coat a 10x10 square of it with ink (or in the shape of whatever the surface is). Anything that moves into this ink is given the "Inked" condition (see below). This will also subtract one ink point.
• Alternatively, you may instead attack an enemy with the inkbrush once it is coated in ink (you must have ink at least 1 ink point to do so). If you do so, your hit modifier is equal to your proficiency modifier + dex modifier and damage is equal to (lvl/5)d6+dex modifier, with the minimum being 1d6, and the maximum being 4d6. .
• If you hit an enemy with the inkbrush, they are given the "Inked" status condition (see below), and you will lose one ink point.

Enemies that are in ink have the condition "Inked" applied to them (see below).

• Any creature, besides yourself, that moves inside the ink will have their movement speed halved (Specifically, 1 square of an inked surface is treated as 2 for movement).
• If the inkling is in squid form while the inked condition is applied, they may take a bonus action to regain an ink point (this will allow you to perform actions involving ink)
• If the inkling is in squid form and moves in any way while they have the inked condition, they will move twice as far.
• Any creature that has the inked condition will lose it upon leaving an inked surface.

Inklings can use ink through ink points, which basically describe how much ink they have on them at any given time.

If you are in squid form and have the "inked" condition (see below) and use a bonus action to do so, you may gain an ink point, to a maximum of 20. With these ink points, you can spray surfaces with ink or use powerful ink attacks.