Morgogh

A morgogh is a slimy creature that can transform itself into a perfect copy of an other creature that were killed and touch by him. It speaks then the language of the chosen creature, but it doesn't copy the knowledge of the creature. Another problem for that creature is its slimy normal form. While it is disguised it uses magic. After 3 to 5 days based on the size of the creature it needs to replenish its energy. For that it transforms back to its eerily from. While in this form it leaves a path of its slime.