Chapter 13 cleared in 3 turns with 1 warp and 1 rewarp. 34 turns so far in this run.
All that training we gave to Chloe from C8 to C12 culminates in this 3-turn clear, where she soloes the two bosses on her own while the rest of the team goes for the rescue staff. Chloe needs her 3rd STR proc at Wyvern lvl4, both energy drops we have available, as well as Lucina-engraved killing edge+5 to reach 37ATK as griffin. This benchmark is important because the brave axe boss has 54HP, 23DEF and 17SPD. 37ATK is just enough to crit-kill him with one 50% crit out of two hits -- otherwise Chloe would need to land double-crit twice, with much less chance of success. Killing edge is also important because its weight does not drop Chloe's SPD down as much so that she still (barely) has 22SPD to double this boss. While killer axe has 2 more might, the 2 more weight could not be compensated for.
Even with these benchmarks in our hands, we still need to rig a good amount for this clear. Chloe needs to dodge every 15% hit from the brave axe boss (4 times). She also needs to raging storm kill the tomahawk boss by dodging his 37% hit, landing her own 57% hit and also landing 31% Aymr crit. Time crystal helps a lot with these rigs -- in particular, at the end of Turn 2 player phase I do not let Panette kill a wounded axe fighter precisely to affect the subsequent RN sequence.
Vander makes one more contribution to the run by bonded-shielding Kagetsu in Turn 1 and Alear in Turn 3. It's important that Vander equips a light weapon in Turn 3 to have 12SPD, because the invisible long bow sniper in the bottom part of the map could reach Vander, and he has 16SPD.
The rescue staff in the bottom-left village is somewhat tricky to get in 3 turns. A simpler solution would be to spend another warp staff, but I was happy to figure out that 3 drawbacks could do the job as well. Eliwood ring is pretty op.
Standard Arena: Ivy*3.
Emblem Arena:
-- Chloe needs Lyn lvl5 to inherit SPD+2 to reach 22SPD and double both bosses (she has 302SP, which is just enough);
-- Chloe also needs Edelgard lvl20 for +5STR and Deep Synergy;
-- Ivy needs Lyn lvl5 to inherit SPD+1 to reach 19SPD and double the nearest sword fighter and not be doubled by the swordmaster.
Forging and Engraving:
-- Lucina-engraved killing edge+5 for Chloe to dodge and crit-kill the bosses;
-- Marth-engraved hand axe+2 for Kagetsu to kill the hand axe fighters on the left side of the map, and crit-kill a sniper (this crit is not necessary since Ivy can finish the sniper with thunder, but it's good because Ivy can still get staff exp).
-- Edelgard-engraved javelin+3 for Kagetsu to kill the sword fighters in the bottom-left corner.
Class Changes and Stats Boosters:
-- Chloe reclasses to sword griffin for sword and staff access;
-- Ivy takes the spirit dust from Chapter 9.