Navigate through Euclid Castle's various floors and corridors. The path is relatively linear, but keep an eye out for hidden passages or rooms containing treasure chests. You'll encounter Knights, Archers, and sometimes even Magic Users. Prioritize taking out Magic Users first, as their spells can be disruptive. Use Cress's Artes to deal significant damage, and rely on Mint to keep your HP topped up. You'll eventually reach the prison area where Mint's mother, Maria, is being held. After a brief reunion, you'll face your first major boss: the Golem. Refer to the 'Boss Guides' section for a detailed strategy. After defeating the Golem, a series of events will lead to your escape from Euclid and a new objective: finding the Unicorn's Horn in the White Forest.
