Bound Hero Battle: Cecilia & Lilina

Sanaki must have draw back and Red tome breaker. Fist Kill the blue flier with brave bow b Cordelia then use reposition twice with the help of a dancer.next turn with Cordelia kill the Blue horse use reposition and use dance to save Cordelia. Next turn Then kill lillina with Cordelia,kill Cecilia with sanaki and use dance to save Cordelia. Next turn you should have killed the Red mage with sanaki then finish off the bow user with b Cordelia. Also ninian Can be changed to any dancer and sanaki is Better If She has a special like iceberg and She has TA (She could also work good with Green tome breaker but Is Better Red One). Bridal Cordelia has lnd2 and brave bow.

1st destroy the northern wall
2nd kill the blue flyer with Reinhardt and pull him back
3rd kill Cecilia with Xander, Lilina and Blue Lancer with Reinhardt
4th kill the mage with Mathilda and the archer with Reinhardt

Link,
(Lunatic) https://youtu.be/432fNe6Z7us
(Infernal) https://youtu.be/RVVQ9gj-OrA

This guide will showcase placement; assuming horizontal spaces are lettered A-F, and vertical spaces are labeled 1-8 top to bottom (eg. Cecilia is on C1 and Archer is on A3)

Your team should contain 2 Hone Cavalry, and 2 Fortify Cavalry, or 2 Hone Cavalry, 1 Fortify Cavalry and Reinhardt with Ward Cavalry.

Reinhardt must have Death Blow, Lancebreaker, Ward/Fortify Cavalry. Reposition, and Miracle if he does not have neutral HP and RES Boon. Have him hold the Attack+1 Sacred Seal.

Camus should have DEF+3, any B Slot [preferably Renewal as it works as reassurance], Hone/Fortify Cavalry, Reposition, and Noontime. He should be holding the HP+3 Sacred Seal.

Olwen, Cecilia, or any Cavalry Mage that is able to deal 50 damage to a Blue unit can be used here. [Delthea may be used here though that means Camus must use Fortify Cavalry] Must have Reposition, Fortify/Hone Cavalry [or in Delthea's case, Dark Aura and Hone SPD or Drive ATK] and Breath of Life 1 Sacred Seal for reassurance.

Priscilla should be sporting RES+3, any B Skill, [preferably Live to Serve, but I was using a Wrathful Staff build, so this spot is flexible] Fortify Cavalry, Recover/Rehabilitate, Imbue and RES+1 Sacred Seal [the Sacred Seal is optional]

With all these presets out of the way, the guide starts here.

Begin with this configuration:
Reinhardt on E6; Olwen/Cecilia on F6; Priscilla on E7; Camus on F7
1. Reinhardt break E4 barrier
2. Camus to F5
3. Priscilla to E5
4. End turn 1.
5. Priscilla to E2
6. Reinhardt to E3
7. Reinhardt eat ENEMY Pegasus Knight [D2]
8. Camus to E4
9. Camus reposition Reinhardt to E5
10. Olwen/ Cecilia to F5
11. End turn 2.
12. Reinhardt to F3
13. Reinhardt eat ENEMY Cecilia [D3]
14. Priscilla to E5
15. Priscilla heal Camus
16. Olwen/Cecilia to E6
17. Olwen/Cecilia reposition Priscilla to E7
18. Camus to E5
19. End turn 3.
20. Reinhardt to E4
21. Reinhardt eat ENEMY Lilina [E2]
22. Olwen/Cecilia to F5
23. Olwen/Cecilia eat ENEMY Blue Cavalier [D5]
24. Camus reposition Reinhardt yo E6
25. Priscilla to F6
26. End turn 4.
27. Reinhardt to D5
28. Reinhardt eat ENEMY Red Mage [D3]
29. Camus to E4
30. Camus eat ENEMY Archer [E3]
END

Possible complications [untested by me]
-Cecilia/Ursula/Blue Cavalry mage did not KO Blue Cavalier in step 23
•Try to equip Death Blow 3 or another such attack buffing A Skill. Although, already buffed with Priscilla's Hone Cavalry, a poor IV can create this predicament.

-Reinhardt died to Lilina in between steps 19 and 20.
•If this problem occurs, try to equip Miracle if it has not been done already. If that fails to work, I cannot help then.

-Camus died to the Archer in between steps 27 and 28.
•Try equipping Renewal 2/3 on him. Make sure you have an HP+3 Sacred Seal equipped.

Listed units are all 5* and Lvl 40 unless otherwise stated. Particularly important skills are emphasized with a *. Keep in mind that these are simply the exact units I used, so the exact IVs and skills may or may not be necessary. Units are listed in the same order as the positions displayed in the map above.

1. Frederick (+ATK, -RES)
Weapon: Brave Axe*
A: HP 1
B: Drag Back*
C: Fortify Defense 3
Special: Luna
Support: Reposition*
Sacred Seal: Foritify Res 1
Notes: Can be replaced by any hard-hitting unit, preferably green, with similar stats that can one round KO the blue flier.

2. Camus
Weapon: Gradivus*
A: Fury 3*
B: Vantage 3*
C: Goad Cavalry 3
Special: Bonfire*
Support: Reposition
Sacred Seal: Spur Def 1
Notes: Vantage and a damaging special like Bonfire are absolutely necessary.

3. Ike (+ATK, -RES)
Weapon: Ragnell*
A: Heavy Blade 3
B: Quick Riposte 3*
C: Threaten Def 2
Special: Aether
Support: Reposition*
Sacred Seal: HP 1
Notes: Replacements include Ryoma, Xander, or any unit that can tank a hit from Cecilia and kill her in return.

4. Delthea (+HP, -ATK)
Weapon: Dark Aura
A: Death Blow 3*
B: Desperation 3
C: Drive Attack 2
Special: Miracle
Support: ---
Sacred Seal: ---
Notes: Since mine is a -ATK nature, death blow 3 is absolutely necessary to one shot Lillina. Life and Death 3 leaves her with 1 HP. If you have a -SPD nature, Life and Death will be better so that you can double her. Replacements include any hard hitting unit (usually a blue mage) that can one round kill Lillina, and at least has some way of buffing Camus' attack.

Turn 1: Move all units up 1 space.
(Enemy Phase): Nothing happens.

Turn 2: Use Reposition with Frederick to move Camus left. Kill the blue lance cavalier with Camus. This will put Camus in Vantage range and get his Bonfire ready. Move Delthea up one space.
(Enemy Phase): The red mage should suicide on Camus. All other enemies should start moving right.

Turn 3: Retreat everyone down as far as possible, leaving Ike in range of Cecilia to kill her. Put Camus out of range of any threats if necessary.
(Enemy Phase): Cecilia to die to Ike. Other enemies should continue moving closer.

Turn 4: Move Delthea up 2 spaces and kill Lillina. Use Reposition on her with Ike to move her down. Kill the blue flier with Frederick. Drag Back should put him out of range of the archer. Camus can do his own thing.
(Enemy Phase): The archer should move closer.

Turn 5: Kill the archer with any combination of your units. If your Delthea has Desperation, she should be able to do the job alone.

As usual, I do not guarantee success as small differences may trigger changes in AI behavior. Good luck!

TEAM SPECS:

Sonya (+HP -Def)
-Reposition
-Moonbow
-Fury 3
-G Tomebreaker 2
-Res Ploy 3

Camus (N/A)
-Reposition
-Bonfire
-Fury 3
-Vantage 3
-Hone Calvary

Xander* (N/A)
-Reposition
-Moonbow
-Attack + 3
-Quick Riposte 2
-Fortify Calvary

Reinhardt (+Atk, -Def)
-Reposition
-Luna
-Death Blow 3
-R Tomebreaker 1
-Fortify Calvary

*You dont necessarily need Xander, since all he will do is provide the fortify calvary buff. Therefore, use anyone that can provide this buff.

STRATEGY: With this team, Sonya and Reinhardt (of course) will be putting in most of the work. First, position Sonya so that she can debuff the lance cavalier's Res on the next turn otherwise Reinhardt, surprisingly, won't be able to kill him. On the second turn, have fully-buffed Reinhardt defeat the lance cavalier and end your turn. On the enemy phase, the red mage will not be able to OHKO Reinhardt despite the Redwolf tome, and Reinhardt will be KO the red mage. On the third turn, move all units out of range except Sonya, who will e placed in Cecilia's range while being out of range of the blue flier. On the enemy phase, Cecilia will be KO'd thanks to Dark Excalibur + Moonbow. On the fourth turn, have Sonya deal chip damage to the blue flier and have Camus deal the landing blow; Camus will also be put in range of Lilina. Again, make sure Xander and Reinhardt are out of range. On the enemy phase, Camus will deal with Lilina just fine. Finally, on the fifth turn, simply have Reinhardt defeat the archer.