A year after the events of March of the Machine, we revisit Ixalan, the plane packed with pirates and dinosaurs. Things have changed since the disappearance of the Immortal Sun.
Once again, there is a scramble as the groups race toward the center of Ixalan in search of a new resource: cosmium. Once they get past the caves, they find that Ixalan is a hollow world with Ixalan's Core in the middle and lit by Chimil, its own sun. An ancient civilization, ancestors of the Sun Empire, uses the magic of Chimil to grow in power. Packed full of pirates, dinosaurs, vampires, and merfolk .. The Lost Caverns of Ixalan has something for everyone!