The Murska

Only mentioned once in the 2e "Planes of Chaos", the Murska is an 8 foot long beetle native to Pandemonium. The Murska are strange shape changers who grow a coat resembling that of their last meal, as well as learning some memories and languages of that creature. And that... is about it.

Combat-wise the Murska is lacking, with only a grapple attack and gaining no benefit (Its AC is actually worse by 2) when in a disguise.

The idea of a beast that takes on the mishapen form of its last meal is right out of a campfire story. I imagine small groups of these Beatles scurrying along the walls of damp caverns, looking for weak or slow creatures they can hunt. While at rest around a the camp, a familiar looking face and voice might appear from the dark, only revealing its true form once it is too late.

When making the stat block for the Murska i wanted to make the changing form of the Murska matter more because I find it to be the most interesting aspect of the fiend. After consuming a creature the Murska gains several changes for the next 12 hours. The Murska has its AC drop, gains advantage on charisma saves, gains the languages of the creature, and gains one Trait from the creature.