Just did a generic female Avatar, going with +Mag/-Luck.
Premonition: 2/2 Turns
This took me 3 attempts. Goddammit, Robin.
Prologue: 5/7 Turns
Unfortunately Fred had to take the boss kill, but this took me like 20 attempts anyway so I call it a victory either way. I got a level on Robin either way and she got HP/Str/Mag/Skl/Spd/Res. I call it a win.
Chapter 1: 5/12 Turns
I fail to understand how a unit with a 65% Strength growth fails to level strength 90% of the time. This took me like 30 attempts cuz Freddy decided to be unepic for like half an hour.
Strat for this is sort of an improvised version of Chiki's 4 turn but I can't use Sully to chip the archer (which does in fact cost me that 1 turn). Fred gets the bronze sword from Robin, pairs up with Chrom and gets on the fort. He levels strength and speed which lets him ORKO the generic non-HP+5 fighters and also double the boss. Also important for Fred+Chrom or Robin+Virion to get a dual strike to kill a merc, otherwise Robin dies on EP. After a bit of weakening the boss and a vulnerary use, I was able to feed the boss kill to Robin. She got a level but it was HP+luck, and that this point I was done with the chapter so I decided to move on.