Poison

A violent shudder traveled through the centipede, beginning at its head and traveling the entire length of its body. It thrashed back and forth, slamming into the cliffs on either side. With every impact, water spewed from the chinks in its carapace, and the centipede movement dulled. With a final scream, the centipede stiffened and its flailing legs stilled. Then, its head exploded in a pressurized rush of fluid–conjured water, blood, and a grayish substance that looked like brain matter.