Fire Emblem: Fortune's Weave's paralogues operate on strict deadlines, and they can be very easy to miss. However, they're among the most important optional quests you can take on. Paralogues are how you get certain plot-important characters to join your team later, and if you don't have time or don't want to play multiple routes, you can also use paralogues to get the three other Flame Lords to join you in Part 3, albeit in a limited capacity.