Dual Compendium (Lost Index): Ylisse and the Exalted Prince.
So as all none of you remember, Robin appeared as an ally once in the main story. He assisted [Leo in rescuing Shanz] before the Lockdown/Liberate stage arcs then briefly trained Takumi and gave Leo the ability to class change into Grandmaster.
What you all don’t know is that, at one point, I was going to have a stage in either Takumi’s “Liberate” or later on in The Great Maze that would reintroduce Robin to the teams and with him, a temporary ally (for that stage at least) in his best friend Chrom.
Subspace and Shadow Bug infested Risen were going to wreak havoc upon the home of the Shepherds, and any Awakening based RPers would’ve been welcome to leap in and fight the good fight.
Maybe someday, when I’m feeling wistful, I’ll make that forgotten chapter a reality here. Like a... Dual Xenologue, if you will.