Dungeons & Dragons 5E lead designer Mike Mearls' latest project combines his current and former employers--on D&D Beyond you can now access a digital exclusive product from Chaosium which brings the Cthulhu Mythos to D&D 5th Edition.
The supplement is called Cthulhu by Torchlight and includes subclasses, feats, and spells designed for 5E.
Cthulhu by Torchlight adds a new subclass to each of the character classes in the new Player’s Handbook, along with over two dozen Mythos-themed spells, a new background, and new Origin feats. For DMs, it holds over 20 horrid monsters of the Cthulhu Mythos. Rules for Passions and Dreadful Insights amplify roleplaying by putting mechanics behind your characters’ personality, while the skill challenge rules provide a framework for investigation, interaction, and other non-combat encounters.