We recommend using rare egg-enhancing Prayers and Charms before setting out on one of these expedition quests. If you do decide to create your own quest room, you can force-start the quest from the main menu without waiting for another player, in which case the game will supply an AI partner. To take part, you'll either need to join someone else's quest room, in which case you don't need a ticket, or you will have to supply a ticket to create your own quest room. (Explore) Ice Eggs is where you will find Elderfrost Gammoth, and (Explore): Water Eggs is where you'll find Soulseer Mizutsune. These new multiplayer quests can be accessed from the Multiplayer Option on the Quest Board once you have downloaded the new update.
Two new Co-Op Expedition quests have been added where you can battle Soulseer Mizutsune and Elderfrost Gammoth - and snatch up their eggs while you're at it.