Star and Savior - Fire Emblem Mystery of the Emblem Book 1 Walkthrough Part 14

After routing General Hollstadt's forces in Altea, the remaining Grustian forces prepare to hold Altea's capital, Anri, under Morzas, a Mage Dragon from Dolhr. The Archanean League rally their forces and prepare to siege Anri. Not too much to say here other than to acquire the Membership Card. Although it isn't a necessity to beat the game, it does greatly help. Outside of weapons, they also sell stat boosters and promotion items. If you're using multiple units from a class line like Mercenary, you'll need these Secret Shops in order to acquire more Hero's Proofs. If nothing else, the stat boosters will make your great units overpowered.