Your Charisma score increases by 2. In addition, one ability score of your choice increases by 1 .

Formless are fully adult-sized within a few weeks of birth and typically live around a century or less. While Talshana'a can transform to conceal their age, the effects of aging affect them similarly to humans.

The Formless can fall into any alignment, but those who enjoy flitting through Faces tend toward chaotic, while those that prefer the pragmatism and focus of limited Identities tend toward neutral or lawful. 

Formless have a set body mass that is most comfortably rendered as a humanoid of between 5 and 6 ft and 100 to 250 pounds. You can alter your size and body shape to accommodate the forms of other bipedal creatures with the same basic configuration of limbs, but your base size is Medium and you have a set amount of mass with which to work. As such, becoming a lithe halfling or gnome is very difficult, as you would be compressing your substance into much smaller confines, and becoming a larger creature would present similar problems (see the Shapechanger ability for more detail). 

To calculate your base size and weight, at random, use the size modifier method, below: 

Size modifier: 2d6
Height = 5 ft + your Size modifier in inches. Minimum = 5'2", Median = 5'7", Maximum = 6 ft.
Weight = 100 lbs + (2d6 * your Size modifier). Minimum = 104 lbs, Median = 149 lbs, Maximum = 244 lbs.  

Your base walking speed is 30 feet.

As an action, you can change your appearance and your voice. You determine the specifics of the changes, including your coloration, hair length, and sex. You can also adjust your height, but your overall mass remains the same. As such, you can mimic a creature of up to one size above or below your base size of Medium, but doing so requires Concentration to maintain and is subject to Concentration checks if you take damage. You can not maintain Concentration spells while in larger or smaller forms.

You can make yourself appear as a member of another race, though, in most cases, none of your game statistics change. Claws and teeth are facsimiles only and can not do damage due to the natural softness of the Formless body (see Boneless). If you adopt a form that provides specialized movement (such as a swim speed due to webbing), you can gain the specialized movement capability if that form is an Identity that you have maintained and practiced for several months and the movement does not conflict with other limitations. For example, you can not gain the climbing ability of a Tabaxi as it is tied to their claws and claws are subject to the rule mentioned above. 

You can't duplicate the appearance of a creature you've never seen, and you must adopt a form that has the same basic arrangement of limbs that you have. If a creature has additional limbs, such as wings or a tail, you can not create these elements in your transformation, though you can create the rest of the body.  

Your clothing and equipment aren't changed by this trait and you stay in the new form until you use an action to revert to your true form, lose concentration on the form in instances where that applies, or until you die. 

As a Shapechanger, you are subject to the effects of the Moonbeam spell, and are immune to the Polymorph and True Polymorph spells.  

The physiology of the Talshana'a is reminiscent of an ooze, but is both held together and limited by, among other things, their unconscious perception of themselves as humanoid. While the Formless must maintain a general humanoid shape, they can focus their abilities to accomplish things that humanoids with bone structure can not. This does not always work in their favour, however, as it also means that, regardless of the quality of their assumed form, others may identify the Formless by simply squeezing parts of the Formless' body and discovering how pliable they truly are. 

Tight Spaces. When not encumbered by clothes, armour, or other body coverings, you can squeeze through tight spaces. You can not move through anything narrower than 3 inches in width and for every inch below 6 inches across you receive 1d6+2 Bludgeoning damage per foot travelled. You can only perform this ability in your natural form. 

Extended Reach. As a Bonus Action, you can choose to extend your arms' reach to a maximum of 10 feet, but Melee Attacks must be rolled at disadvantage. If you choose to lengthen your legs instead of your arms, you gain up to 3 feet in height, but must roll Dexterity Saving Throws at disadvantage. Your movement speed remains the same. 

Corners. You can bend your body -- or parts of your body -- around corners. If you can not see your body part, whatever you are attempting that requires a roll must be rolled at disadvantage. You can only move to the maximum of the Extended Reach feature, above. 

Reinforced Simulacrum. When touched or squeezed by a creature, you can focus on the area of contact and reinforce it by borrowing from other parts of yourself to add density in an attempt to fool the creature. You have advantage on Charisma (Deception) checks in these situations. 

These abilities require Concentration to manifest. As such, you can not maintain any abilities or spells that also require Concentration. You do not, however, need to roll Concentration checks for damage. 

You gain proficiency with two of the following skills of your choice: Deception, Insight, Intimidation, and Persuasion.

When a creature you can see makes an attack roll against you, you can use your reaction to impose disadvantage on the roll. You must use this feature before knowing whether the attack hits or misses.

Using this trait reveals your shapeshifting nature to any creature within 30 feet that can see you. Once you use this trait, you can’t use it again until you finish a short or long rest.

Once per day, you can focus your Shapechanging abilities to avoid or even repair some of the damage done to you. 

Preternatural Avoidance. You can reflexively bend or even open your form out of the way of in incoming attack that requires a roll against your armour class. When an attacker that you can see hits you with an Attack, you can use your Reaction to halve the attack's damage against you. 

Restitch and Repair. If you receive a Critical Hit and survive until your turn, you can spend your entire turn (Action, Bonus Action, Reaction, and Movement) or even multiple turns, repairing yourself. For each turn spent, you recover up to 1/3 of the damage received from the Critical Hit. You can choose speed up this process and negate more of the Critical Hit in one turn, but each additional 1/3 of HP recovered in one turn adds a point of Exhaustion.  

As a weapon of last resort, Formless can elongate and harden their extremities to talons capable of slashing their enemies. The process is painful for you, as it requires sending extreme amounts of your substance into a small, focused space and aligning it in a similar fashion to crystal. Creating the talons requires an Action and inflicts 2d6 Force damage to you. 

Talons do 2d4 + your proficiency modifier in Slashing damage. You can use your Bonus Action for a second attack (without adding your proficiency bonus) as with the Two Weapon Fighting ability. Attacks can be combined with the reach afforded by the Boneless trait. 

With talons extended, you can not properly do things that require manual dexterity of the fingers, so all Weapon Attacks, Sleight of Hand checks, Tool checks (including Thieves' Tools) and Performance checks with musical instruments are at disadvantage. Retracting your talons requires a short rest. 

You can speak, read, and write Common and two other languages of your choice.