I am planning on making a Locathah, and I found the Dhampir subrace/liniage. And by default, and Dhampir has "Deathless Nature. You don't need to breathe." But Locathahs have the trait of "Limited Ambhibiousness. You can breathe air and water, but you need to be submerged at least once every 4 hours to avoid suffocating."
The thing that I'm asking about is if Deathless nature overrides Limited Amphibiousness. It says that they SUFFOCATE which alludes to breathing,and the deathless nature makes them unneeded to breath. So does making a Locathah a Dhampir override the limited air breathing?