The mega sloth is a three-toed sloth mutated by radiation. Standing over nine feet tall, its body is covered with filthy, shaggy fur with clusters of mushrooms growing in the fur on its back (similar to how real-life sloths allow fungus to grow in their fur), as well as heavily calloused patches of skin and a mouth full of sharp teeth. The mega sloth is also highly aggressive and fast, at least by sloth standards.
Mega sloths can be found hanging from trees or walking about throughout the Mire. Once a player character nears one of these resting sloths, they will drop down to the ground. Though not immediately hostile, they may become aggressive if the player character gets too close. They will then use their claws to scratch and throw rocks at the player character, and they may even release fungal spores from the mushrooms growing on their backs. They are tough, quick-footed and deal heavy damage to an unarmored target.
The mega sloth may be a reference to prehistoric giant ground sloths, some varieties of which could be the size of elephants. The first real-life mega sloth was found on a cave in Greenbrier County, West Virginia.