Hades' Stairway (黄泉の階段 Yomi no kaidan) is Chapter 21 of Fire Emblem: Fates in the Conquest Version.
Subjective: The following part of this article is based upon the editor's personal experiences and opinions, and therefore may not be applicable for all readers.
Unlike other chapters, your units must escape the monsters that line up the "stairway". Unfortunately, your units are at the bottom of the stairway while the escape area is at the top. In addition, there are powerful Faceless and Golem units that are in the way of escape. Faceless reinforcements will appear from either the top or bottom of the map indefinitely every turn. The Dragon's Vein in this chapter will allow you to freeze all enemies on the map for one turn.
Champion of Wind Village
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Princess Sakura of Hoshido