chondri devil fruit thing

Tsuba Tsuba no Mi, or the Wing-Wing Fruit (Paramecia)

Benefit: Depends greatly on the type of fruit. The player
controlling the character should work with the DM to
construct a custom feat list for their specific abilities.
Characters may purchase one feat from their fruit’s list
when they first eat it for free. There are three ways of
attaining devil fruit feats from then on. First, the
character can spend their normal feat points. Second, the
character will earn one devil fruit feat for free every two
character levels after its first eaten. Lastly, a character
might spontaneously earn a new fruit ability in dire
situations. This third case would be controlled purely by
the DM, as a way of rewarding players. The maximum
number of fruit feats a character can obtain is half their
character level.

Side Effects: The character that ate the devil fruit can no
longer swim and has a water movement rate of zero.
They also sink regardless of what they are wearing.
While sinking in the water, the character cannot move
and should be considered paralyzed. If rescued, the
character takes 10 rounds (one minute) to recover before
they can move again. The character may also gain other
unique advantages/disadvantages based on the nature of
the fruit eaten