—Rhea to Byleth
After Byleth merges with Sothis, Rhea implores them to sit on the throne inside of the Holy Mausoleum. Suddenly, the Flame Emperor appears with the intention of raiding the Mausoleum and steal the Crest Stones inside.
Events of the tomb differ slightly and the story takes a drastic turn. The future of Fódlan hinges on which house Byleth is instructing. All of these changes begins as the Flame Emperor's identity is finally revealed...
Alois - Can be recruited in the Monastery if Byleth is at least Level 15.
If teaching the Black Eagles, this can potentially be the final month to recruit any students from outside of the Black Eagle house. If the Crimson Flower choice is selected, this will be the final month to recruit any remaining students. If the Silver Snow choice is selected, they are given one additional month. This warning does not apply to those teaching the Blue Lions and Golden Deer until the next chapter.
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.
Enemy units are tasked with stealing Crest Stones, so not all of them will target your units (watch the aggro lines). This gives the player more leeway to target the other enemies, such as the Monsters. Also, when the thieves have stolen one or more Crest Stone, only a select few will target your units if they are in the way to the marked exit zone. Others will circumvent your units (or use the Pass skill in Maddening mode).
The units on the stairs move as one group if a player unit enters their aggro zone.
Enemy units will raid the tomb of the Crest Stones there and may or may not raid more than one. The player is tasked to recover as many of them as possible by killing the bandits. If a bandit is carrying more than one Crest Stone, the player will recover all of them upon killing the bandit. Depending on how many are recovered, the player is rewarded with increasingly better rewards.
The most important of these rewards is the Knowledge Gem, which increases the rate at which a character will earn skill levels while equipped. Since one can only get up to two Knowledge Gems during any playthrough, it is highly advisable to ensure that all of the Crest Stones are recovered.