Want to add some Lovecraftian horrors to your D&D games? Then Mythos Monsters is the book for you. It's got dozens of terrifying, mind-bending, alternate-dimension creatures ready to invade your world. The book is up on Kickstarter now.
From the campaign:
Mythos Monsters is a 72-page full-color 5E bestiary featuring over 40 fantastical beasts drawn from and inspired by the writings of H.P. Lovecraft and August Derleth. These dream-haunting, sanity-devouring masters of madness and their murderous minions have haunted the pages of games like Dungeons and Dragons and Callof Cthulhu since the earliest days of RPGs, and within these pages you'll find a ton of terrific terror to unleash upon your unsuspecting players!
The campaign's well up and above its funding goal with 13 days left to go.