Thwomp

Thwomps are mysterious, yet vicious, enemies who have migrated to the world of Hyrule from the Mushroom Kingdom, and will crush Link as eagerly as they have attempted to do to thier nemeses, Mario and Luigi. They are massive blueish or greyish blocks, covered with spikes, who seem to have the ability to raise themselves up into midair and then drop themselves onto their prey with terrible crushing force.

They first appeared in Super Mario Brothers 3, but were introduced into the Legend of Zelda Series in The Legend of Zelda: Link's Awakening. Since then, thwomps have appeared several times, once even as a boss!