—Lan Mandragoran, The Eye of the World, Chapter 49
—Sammael, Lord of Chaos, Chapter 23
A jumara, also known as a Worm, is a type of Shadowspawn that was created by Aginor sometime before or during the War of Power, currently found in the Blight. The jumara are merely a larval stage to an even more horrible and dangerous type of Shadowspawn. The jumara that currently plague the Blight will never transform. Why this is the case is not known, nor is it known what causes them to transform into their adult forms.
Jumara are extremely dangerous. They appear as large worms and their movement makes a very loud squishing sound. Traveling in groups called Wormpacks, a person can hear jumara cry to one another, a chorus reedy and shrill. A single jumara can kill a Myrrdraal; most of the terrifying creatures in the Blight will flee from a jumara, although jumara themselves are scared of whatever creatures live in the high passes of the Blasted Lands.
Jumara are very effective at overtaking prey. In order to survive an encounter with jumara, the Worm must be cut to pieces.
Adult jumara are multi-pedal insectoid creatures, and are vastly more dangerous than their juvenile forms. They are covered in spines and tentacles, particularly around their mouth, and grow to gigantic size. Direct use of the One Power against them serves only to make them stronger. It is speculated by Demandred that Aginor had not intended for jumara to serve in the Shadow's armies, but that he had created them simply to see how horrifically monstrous a creature he could engineer. They were noted by Demandred as being nearly immortal unless slain, as they could go into hibernation for millennia, waking only if prey happened to touch one of their tentacles or spines.
While searching for Sakarnen in Shara, Demandred encountered an adult jumara at Rai'lair, The Hearttomb. Somehow the creature had found the ancient cavern as a juvenile, and had matured to adulthood inside. The resulting creature had been too large to fit back out through the mouth of the cave, and so it had made the cavern its home, eating anything that entered. It was described by Demandred as being easily 100 feet long. Demandred only just barely managed to slay the creature, and afterwards commented to himself that had he not known exactly what it had been and how to go about killing it, he would not have survived the encounter.