The amulets of planes walking are very rare magic items that requires attunement. While wearing one, a creature gains the following benefits while not on their home plane of existence.
A creature can breathe normally in any environment, and they have advantage on saving throws made against harmful gases and vapors (such as cloudkill and
stinking cloud effects, inhaled poisons, and the breath weapons of some dragons)
The character can walk on water, lava, snow, and other difficult terrain as if it were normal solid ground (ignoring any damage that would be taken from
normally traversing such a surface).
The character is unaffected by extreme environmental conditions and temperatures.
The character can cast plane shift targeting themselves only once per day, but only to travel back to their own plane.
Notes: One hour of quietly focusing on the amulet and a long rest.