Sand

As an action, you cause your body and all equipment you carry to melt into sand, granting you a burrowing speed equal to your walking speed. In this state, you can freely move through any space connected by sand, dirt or loose earth, creating a ripple effect as a sign of your presence.

This effect lasts for 1 minute or until you take damage, at which point you reappear in the nearest space within 5 feet of your position. If there is no room for your body to reappear, you take 8d6 force damage and are shunted into the nearest open space. You can use this power an amount equal to your proficiency bonus, and you regain all uses of this feature after you finish a short or long rest.

The words inscribed on the stone tablet ring in your head:

"Wielder of Earth's might,
Lay your hands upon this stone.
I shall grant thee the power to melt into the earth,
The power of Sand!"