Final Boss Energies
Postcard credit: Ad for the "Les Géants de la Science-Fiction" book signing event series (Virgin Megastore France, 1997).
Pin: Kurzgesagt, purchased from their shop.
Sticker: Astrawitch.
Card: "Yog-Sothoth, The Dark Myth" (douzen, 2015), from Force of Will - The Moon Priestess Returns, published by Eye Spy Productions.