Bound Hero Battle: Alm & Celica

Alright, so these units require a few things. Arvis needs Spd Ploy 3, Fury, Recovery Ring and the +1 Spd Sacred Seal, H! Sakura needs Desperation and Reinhardt needs Lancebreaker 3. To start, place the units with H! Sakura on the far left, Arvis on the inner left, Reinhardt on the inner right and B Lyn on the far right. Make sure that Arvis' Ploy abilities hit the Green mage. Move him up to the wall (next to the broken wall, but do NOT break it) and leave everyone else where they are. The G Mage will Atk Arvis and won't do any damage and Arvis will take away half of his HP. The Axe Pegasus will come in and Ardent Sacrifice for the Mage. Now when your turn starts have Arvis finish off the G Mage as Spd Ploy will lower his Spd to allow Arvis to double. Have B Lyn take out the Pegasus, Reinhardt to take out the Lance user and H! Sakura for the B Cav Mage. Alm will then come in to break the wall, and Celica will attack Arvis but she won't kill him out. Now let H! Sakura damage Celica, Reinhardt take out Alm and Arvis finish Celica. And congratulations you just got 4 orbs, now go summon a 3-star Wrys :P!

The use of 5 star Arvis solves most of the problems presented by the map. It's pretty fun to use the ultimate ploy boy. Give it a try!

Basically, Arvis will bait and chip Green Mage to move the enemies. He can subsequently kill Axe Flier as well as Green Mage. Green Mage can also be killed by other teammates. For the rest of the team, we need a green unit to kill Lance Cavalier, preferably OHKO during enemy phase. We then need a blue unit to kill Alm and Celica under the flames of Arvis. (They are debuffed Valflame and chipped with Growing Flame.) The last teammate is always reserved for a dancer.

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Possible roster:

Arvise: default set

Minerva: Life and Death 3 (need >= 52 Atk), Quick Riposte 1
(Quick Riposte 1 is for OHKO Lancer Cavalier. If you don't have Quick Riposte on Minerva already, you can just tank him once in enemy phase and then attack him again in player phase.)

Cordelia: Drag Back

Olivia: Hone Atk 3
(4-star is fine.)

The basic idea is that we dedicate one unit to bait and kill Blue Cavalier. We use another unit to kill Lance Cavalier, Green Mage and chips Celica without killing her. We also need a dancer to move the team around while, preferably, supporting them with buffs and/or heals.

Thus, one possibility is as follows.

Cordelia with 46 Atk, 35 Spd and equipped with Drag Back, Astra. (e.g. Atk boon, neutral Spd, Spd +3 seal. Slightly less Atk is acceptable. But NOT more. Support her with Hone Atk and also level up your Alfonse accordingly.)

Sonya with >= 47 Atk, 31 Spd and Quickened Pulse seal. (e.g. neutral IV)

Performing Olivia with >= 34 Spd (e.g. neutral Spd) or just sufficient Res.

Alfonse with >= 30 initiating Atk. (e.g. 2-star Alfonse at lvl 35 with Death Blow 2)

Cordelia quads Lance Cavalier (taking 25 dmg), which readies Astra. She can then OHKO the Green Mage using Astra. (With Drag Back, it's ok not to have Astra or other special. She can simply attack again with the help of dancer and Blazing Dance 3 / Hone Atk 3 and then retreats by herself. But be cautious that Galeforce would activate a turn earlier after killing Lance Cavalier and the positions of units may not work out.) 46 Atk is the absolute maximum for attacking without killing Celica on a defense tile. Thus some combination of Astra, attack buff, dancer assist and/or dagger debuff is required.

With Quickened Pulse, Sonya can trigger Moonbow (and thus Dark Excalibur) while baiting and tanking the Blue Cavalier and trigger it again upon attacking in the next turn, killing him after the exchange.

With 34 Spd, Olivia can avoid double by Green Mage. Her Dancer's Fan+ can heal Cordelia while baiting, tanking the Green Mage, also chipping him and debuffing him all at once.

Cordelia with 46 Atk (*WARNING* avoid Hone or Spur Atk support) can chip Celica to 1HP and drag her back --
all the more convenient. Alfonse with 30 initiating Atk can finish Celica at 1HP on defense tile. This leaves only Alm. Alm can be quad by Cordelia at 35 Spd. However, Cordelia would take 19 dmg in the process. Thus, either Cordelia needs to be healed earlier or Alm needs to be chipped to 54 HP first, such as by an attack from Olivia, which does both, or from Sonya.

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Sonya is easily replaceable by any distant counter melee unit.

Possibility 1: Ryoma with 51 Atk (e.g. neutral Atk and Fury 3) or equipped with Moonbow.

Possibility 2: Hector with Swap
<-- although be careful in managing Hector's placement.

Cordelia can be replaced by Minerva. (A non-brave weapon green unit requires 49 Atk and 37 Spd. More Atk may be required pending on Alfonse' initiating Atk.)

As units are replaced, Alfonse may need to be leveled up more or enhanced to 3 star.

Also remember to build a combo that can finish Alm. e.g. Azura can handle Alm easily. e.g. Shigure without Camus would require more range units on the team to chip Alm together.

Link: https://youtu.be/Q-HMkyBJEYg
Palla +3: +ATK -RES
Brave Sword, Reposition, Life & Death.
Cordelia +3: +RES -HP
Reposition, Darting Blow, Wings of Mercy, Goad Fliers.
Cherche +5: +SPD -HP
Brave Axe, Reposition, Ignis, Death Blow, Wings of Mercy, Goad Fliers
Elincia: +DEF -RES
Reposition, Galeforce, Goad Fliers

Brave Lyn (+1) - Default kit plus S-rank summoner support, Reposition, Moonbow and Deflect Magic 2 seal

Nino (+1) - Default plus Draw Back, Desperation 2 and Luna

Brave Lucina - Default plus Reposition, Vantage 3 and Deflect Melee 2 seal

Performing Azura - Default kit, only used for Sing and buffs

Nino to take care of blue units.
Lyn to deal sweeping damage / take out flier unit and mages.
Lucina to deal with Alm and Celica.