You can speak a command word and cause your body to assume the amorphous qualities of an ooze. For the next minute, you (along with any equipment you're wearing or carrying) can move through a space as narrow as 1 inch wide without squeezing.
Your flesh ripples, limbs dissolving into a shifting, translucent mass. Armor and weapons meld seamlessly, stretching and compressing as you seep through narrow cracks. Movement feels fluid, each step a slow, undulating flow of reshaped matter.