Elemental Composition
17th-Level Psion Feature
Starting at 17th level, you gain the High Science
of Psychometabolism, elemental composition.
This gives you the ability to transform yourself
into any element. You can change your body
into dense materials such as iron or obsidian,
sand or earth, water, or even air. While you are
in elemental form, you gain any natural
immunities or vulnerabilities of that element.
For example, a sword cut simply can't harm a
watery or gaseous body, while iron bodies need
not breathe-but they can be rusted. You retain
your limbs and senses. Very dense bodies (stone
or metal) raise your Armor Class to 18 and give
you an effective Strength of 20. Amorphous
bodies give you the ability to slither under doors
and elongate limbs. Gaseous bodies allow you
to drift with the winds. Normal weapons may be
unable to harm some forms, but magical
weapons (and monsters capable of striking
creatures hit only by magical weapons) can
always harm you, regardless of your form. You
may change your form once per round using a
bonus action. If you change your form a second
time, you must use an action to do so. In
addition to the combat abilities of the various
forms, you can always move in the element your
body is composed of. For example, by changing
to sand you gain the ability to burrow through
sand at your normal movement rate. Some
elemental bodies may be excellent camouflage;
It’s hard to see a character made out of nitrogen
gas, for example. This ability last for up to 10
minutes or until you choose to put an end to it.
Once you use this feature, you can’t use it again
until you finish a long rest.
