Outset of a Power Struggle is the last chapter of White Clouds if the player sided with Edelgard after the Black Eagles version of Throne of Knowledge. In it, Edelgard declares war on the Church of Seiros and leads a charge on Garreg Mach Monastery.
Flayn will permanently leave at the beginning of this chapter.
After siding with Edelgard after the skirmish in the Holy Tomb, Hubert teleports the party away and they all find a way into an Imperial provisional camp to discuss the next course of action. Flayn, however, leaves to protect Garreg Mach alongside the Church of Seiros. Edelgard confronts her house on the matter of the revelations regarding archbishop Rhea and the Church of Seiros and asks if they are willing to fight alongside her, to which they all comply. Within the camp, many have conflicting feelings about the turn of events and contemplate their various situations. Additionally, two Imperial commanders have been added into the assault, Ladislava, Edelgard's head of personal guard and Randolph, Caspar's uncle.
After preparations have been made Edelgard directs her army in an assault on the Monastery. While the fight is intense, Edelgard is ultimately triumphant in her assault, forcing Rhea and the Knights of Seiros out of Garreg Mach Monastery. However, before she is forced to retreat she incapacitates Byleth, forcing them into a five-year slumber.
The initial assault is predominately against Armor Knights, with Mercenaries and Pegasus Knights strewn around. If a unit goes too far down the center road an ambush will spring, spawning various powerful units. The main objective of the map is to defeat the enemy commanders: Seteth, Flayn, and Gilbert. The boss, Rhea, can only be reached once these three have been defeated.
Rhea properly appears on the map and switches the objective to defeating her. The inner sanctum switches to ranged units such as Archers and Priests to utilize the Ballista and Magic Orb, with the center road being reinforced with two Golems and the side roads adding in more Mercenaries. Catherine and Cyril are also deployed alongside Rhea in the inner sanctum, however, they do not need to be defeated.
Once Flayn or Gilbert are defeated, a small force of alied reinfeorcements lead by Death Knight will arrive. This only happens once.
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.