It's a delight to see one of the oddest monsters familiar to generations of Dungeons & Dragons/Pathfinder players reskinned to torment superheroes under the Mutants & Masterminds 3e ruleset.
The transfer has been well-effected, with its well-known traits and abilities represented within Mutants & Masterminds mechanics clearly and coherently. Just as with its fantasy original, nobody is quite sure how such a nightmarish beastie came to be, and it is likely that superheroes will be left puzzled as well.
Several neat adventure ideas are provided to help you to incorporate such an unlikely monster into your campaign, preserving its sheer weirdness yet presenting a convincing reason for it to be there.
Maybe sometime soon, it's not just your players who will be gibbering at you...