reprisal is very balanced
You don't actually need Eliwood S ring for this: Madeline with Camilla or Sigurd can use Swap to get Nel into the Goddess Dance range, and then she can get repositioned out by Hortensia/whoever else. Nel can then get repositioned by Boucheron/whoever else after she contracts, and Alear can get healed by Seadall having Quality Time. Sadly this does not leave a spot for Boucheron Physic...
Units:
- Alear: Reprisal+, Sword Power 5, Roy bond 20, here to kick Nil's ass
- Timerra & Corrin: inflicts Draconic Aura and Racket of Solm reduces crit chance
- Ivy & Soren: Anima Focus puts a -3 defense debuff when you attack with a fire tome. Worth noting that using Cataclysm inflicts a -20 Hit debuff too which we don't want since Nil has to hit Alear, and he can start dodging with this
- Seadall is Seadall
- Goldmary rallies with Chrom, this can be anyone if you don't chain attack
- Lapis has Byleth for the Str+4 buff, this can be any other backup
- Veyle has the Alfonse ring equipped to synegize with her personal skill. If you don't have that, you can compensate by using a covert with Marth, they inflict poison with Divine Speed (if you don't do a Boucheron meme and heal with Seadall Quality Time you have a deploy spot for this, you can also have Anima Focus on Ivy&Corrin to free up a spot and replace someone with Timerra, as long as she still inflicts her personal skill). Edelgard on Zelestia can reroll the map until you get Claude for Poison Tactic too for another stack. There's a free Goddess Dance spot above Lapis for the last stack, you'll have to rearrange positions of course
There's also a bunch of easy chain attacks that I didn't trigger since they were a waste of time in this video, like giving a Levin Sword to Lapis, Spear on Goldmary, keeping Timerra in range by cantering 2 spaces to the right instead of down, etc