The lacaric courier singlemindedly delivers strange devices to ancient ruins, sometimes traveling great distances and facing incredible hardships to do so. Why? What's the significance of the cargo or destination? Nobody knows - but don't get in its way! Like a hermit crab seeking out empty shells, the kalyptein crab lives in ancient devices. It often gains unexpected and powerful abilities from its home, making it an unpredictable foe. The silvery liquid namnesis communicates by swapping memories - literally stealing those of its target while implanting its own startling thoughts. It changes form rapidly, even splitting into multiple attackers, and can sometimes steal a character's abilities to use against them...

140 monsters based on or around the strange technology of the ancients. A fantastic complement to Arcana of the Ancients, but also completely usable on its own, this tome of science-fantasy monstrosities will add a whole new level of weirdness and imagination to your Fifth Edition game.