From publisher blurb:
Monster Brief provides a small selection of new, revised, or expanded creatures to be pitted against your players.
This product presents four classic dungeon dwelling monsters to harm, hinder, or gobble up your heroes.
In this product you will find the monstrously manta-like cloaker, masters of shadow and engulfing death, the shapeshifting and deadly mimic that can hide as anything from the chest you are trying to force open to the chair you are sitting in, the thought flayer, with its powerful psychic mind hidden behind a fearsome, squid-like face, and the floating sphere of incomparably dangerous eyeballs, the watcher.
Also included are three new powers, Charm, Mind Reading, and Telepathy.