Default Requirement- A lot of allied units have to have died in order to move on to this chapter. You can recruit a unit from this chapter to help you (obviously if you make it to this chapter that means you are having trouble beating the game).

Chapter 6x: -- Default
Chapter 12x: -- Default
Chapter 17x: -- Default
Chapter 20x: -- Default
Chapter 24x: -- Falchion must not be obtained, Gharnef must be alive, and Tiki must be dead