Stormvault

Stormvault is a cooperative game of exploration and adventure in which mighty Stormcast Eternals heroes search for lost artefacts and battle the fearsome champions of Chaos. Questing throughout the Mortal Realms, you must work together to locate the scattered relics known as Gateway Shards - the only means of unlocking the mysterious Whispering Keep and rescue the arcane treasures stored within. But time is short, and peril lurks in every shadow - you must not fail. —description from the publisher