dragonaichu

If you're still stuck on that S-rank, I'll share my strategy that I used. Deploy: Lissa (preferably with a Brave Axe at 240 power; she'll do massive damage to mages), to guard the base Sakura, to pair up with Lissa Your strongest peg knight (I used Caeda) for offensive duties Rowan or Lianna, whoever's stronger, to pair up with your peg knight. Make sure you deploy them with Enliron/Facinna; Velezark will take tons of damage from it The remaining 4 slots I filled with mage-hitting characters with high resistance as well as some Dracoslayer characters (Hinoka/Cordelia/Leo/Chrom were the 4 I picked). At the beginning of the map, pair up Sakura to Lissa and the twin to the peg knight. Send Lissa to guard the base, and keep two of your AI units at the base and two guarding the allied commander. Using your peg knight, quickly rush the two Sages creating shadows of Validar (with high enough stats, this should only take a couple of minutes). Switch back to Lissa as soon as this is finished and clean up at the base while you command your peg knight to fight some of the shadows hanging around in the northern part of the map. If the base is clear and your peg knight hasn't finished dealing with shadows, switch back to the peg knight and finish the job while you order Lissa to move closer to the Enemy Base. Once the Enemy Base opens, switch to Lissa and command your peg knight to go back to the Allied Base. Lissa wreaks absolute havoc on Validar, and one Dual Special with her and your chosen twin will pretty much do the job. At this point, I was sitting at around 7-8 minutes. The peg knight may or may not be back to the Allied Base by the time you kill Validar, but go ahead and switch over once he's taken care of, commanding Lissa to go back to the base where Velezark will appear. As soon as Velezark shows up, command ALL of your units to fight him. They'll deal chip damage while you slaughter him. Switch your peg knight to your twin and go hard on him. Dual Specials, Awakening, the like. Lissa also deals a ton of damage with Sakura as a pair-up; just make sure she's not disadvantaged when he's in Sword mode. With enough strength (and a lot of this is really just mere strength alone), I managed to complete the whole think in about 12 minutes. Another strategy for Velezark is just to bring a Takumi/Robin pair-up instead of Lissa/Sakura and just load up on Musou bars for both of them while your peg knight and twin take care of the start of the battle. Three Dual Specials to Velezark in a row from Takumi/Robin will kill him easily if both of them are around level 50 or so.