From publisher blurb: Sentient Skies is a module that brings aliens to invade your existing campaign setting.If you're looking for a way to introduce a new age of space to your fantasy world or just end a campaign with a bang, this module is for you. The provided hooks and story arc components are suited for working into an existing campaign or carrying a short campaign from start to finish. Included are: Several hooks, three in great detail Story arc encounters from invading scouts to emplacements to ship battles A mother ship dungeon for the finale Several invading constructs, NPCs, and other monsters from space A flying ship combat system with example ships for both the invaders and the world 20 new spells that emphasize themes of time, space, gravity, and realities. Several items suited to the space fantasy theme. Space fantasy archetypes for 9 of the 12 core classes