From publisher blurb: The Unknown Reaches Out! For every intrepid “hero” who probes the secrets of ancient ruins or cosmic frontiers, there is an alien being which will meet them. The Aberration Bestiary contains a variety of such adversaries utilizing the Spheres of Power and Spheres of Might system, with 20 such entities in all. Ranging from classic foes such as the Aboleth and Drider to the versatile Phrenic Auxiliary to the mighty Great Old One Ravasion, GMs should find no shortage of mighty and distinct foes within this book. Beyond the creatures themselves, The Aberration Bestiary offers new mechanics for tremendous vehicle-scale creatures, new feats and talents for monsters, and a revised and compiled set of rules for psychological strain mechanics. Unlock the possibilities of Aberrations and introduce players to dangers beyond understanding.