From the publisher: In the Astral Sea, the cruelest of liches thrive and even the asteroids are suspect. That's what you'll discover in Monstrous Compendium Volume One: Spelljammer Creatures, the first in a series of monthly drops available to all D&D Beyond users! This collection brings 10 new monsters to your fifth edition Dungeons & Dragons campaign, five from classic Spelljammer lore and five that are brand new. You won't find these monsters in Spelljammer: Adventures in Space, either!