The Solidation Spell is a spell cast by Willow in Tara in order to transform a intangable demon into a solid form so Buffy could kill it.
Incantation:
Child of words, hear thy makers child of words we entreat. With our actions, did we make thee, to our voices, wilt thou bend. With our potions, thou took motive, with our motions came to pass, we resend no pass devotions, give the substance, give the mass! Solid!