Valter GHB One Turn Clear (OTC) - Infernal

Team Comp: Blue Cavalry, Cordelia, Flier, Flier

Inspired by /u/ardx's version, I adapt a similar strategy to work for the Infernal difficulty but much less resource intensive. In this guide, you will learn how to clear Valter's grand hero battle on infernal difficulty, in a single turn! I have broken it down with a video, step by step with screenshots and full character builds you can paste into the KageroChart combat simulator.

Valter GHB One Turn Clear (OTC) Video - Infernal

Combat Log

In the video I used merged units since I don't have the extra units to do make an unmerged team. The actual setup and execution for a pure unmerged team without Heavy Blade is a little different, but not by much.

Starting Positions

Starting Positions

STEP ONE - Reinhardt Kills Red Mage

Reinhardt moves down 3 spaces and kills the Red Mage.

Reinhardt, Thunder's Fist gains 6 attack by initiating combat [Death Blow 3].
Reinhardt, Thunder's Fist attacks. Triangle advantage boosts attack by 20%. 23 damage dealt. 
Red Mage HP: 52 → 29
Red Mage counter-attacks. Effectiveness against Cavalry boosts attack by 50% [Rauðrwolf+]. Triangle disadvantage reduces attack by 20%. 29 damage dealt. 
Reinhardt, Thunder's Fist
HP: 35 → 6
Reinhardt, Thunder's Fist makes a follow-up attack, while canceling any follow-up attack from the opponent [R Tomebreaker 1]. Triangle advantage boosts attack by 20%. Resolve combat as if opponent suffered a 30% defense/resistance reduction [Moonbow]. 32 damage dealt. 
Red Mage HP: 29 → 0

Reinhardt kills Red Mage.

STEP TWO - Cordelia 1 Kills Lance Cavalier

Cordelia 1 moves to the right of Reinhardt and kills the Lance Cavalier.

Cordelia, Knight Paragon gains 6 attack by initiating combat [Death Blow 3].
Lance Cavalier gains 6 defense for having at least 3 more HP than the opponent [Earth Boost 3].
Cordelia, Knight Paragon attacks. 18 damage dealt. 
Lance Cavalier HP: 57 → 39
Cordelia, Knight Paragon attacks again immediately [Brave Lance]. 18 damage dealt. 
Lance Cavalier HP: 39 → 21
Lance Cavalier is prevented from counter-attacking [Firesweep Lance+].
Cordelia, Knight Paragon makes a follow-up attack. 18 damage dealt. 
Lance Cavalier HP: 21 → 3
Cordelia, Knight Paragon attacks again immediately [Brave Lance]. 18 damage dealt. 
Lance Cavalier HP: 3 → 0
Cordelia, Knight Paragon is granted another action [galeforce].

Cordelia 1 kills Lance Cavalier.

STEP THREE - Cordelia 1 Attacks Sword Knight

Cordelia 1 moves right 2 spaces and attacks the Sword Knight.

Cordelia, Knight Paragon gains 6 attack by initiating combat [Death Blow 3].
Cordelia, Knight Paragon attacks. Triangle advantage boosts attack by 20%. 17 damage dealt. 
Sword Knight HP: 78 → 61
Cordelia, Knight Paragon attacks again immediately [Brave Lance]. Triangle advantage boosts attack by 20%. 17 damage dealt. 
Sword Knight HP: 61 → 44
Sword Knight counter-attacks. Triangle disadvantage reduces attack by 20%. 25 damage dealt. 
Cordelia, Knight Paragon HP: 40 → 15
Sword Knight prevents any further follow-up attacks [Wary Fighter 3].

Cordelia 1 attacks Sword Knight.

STEP FOUR - Cordelia 2 Kills Valter

Cordelia 2 moves to the left of Cordelia 1 and kills Valter.

Cordelia, Knight Paragon attacks. 18 damage dealt. 
Valter HP: 67 → 49
Cordelia, Knight Paragon attacks again immediately [Brave Lance+]. 18 damage dealt. 
Valter HP: 49 → 31
Valter counter-attacks. Resolve combat as if opponent suffered a 50% defense/resistance reduction [Luna]. 42 damage dealt. 
Cordelia, Knight Paragon HP: 43 → 1
Cordelia, Knight Paragon makes a follow-up attack. 18 damage dealt. 
Valter HP: 31 → 13
Cordelia, Knight Paragon attacks again immediately [Brave Lance+]. 18 damage dealt. 
Valter HP: 13 → 0
Cordelia, Knight Paragon is granted another action [galeforce].

Cordelia 2 kills Valter.

STEP FIVE - Cordelia 3 Kills Axe Flier

Cordelia 3 moves above Cordelia 1 and kills the Axe Flier.

Cordelia, Knight Paragon gains 6 speed by initiating combat [Darting Blow 3].
Cordelia, Knight Paragon attacks. Triangle disadvantage reduces attack by 20%. 16 damage dealt. 
Axe Flier HP: 52 → 36
Cordelia, Knight Paragon attacks again immediately [Brave Lance]. Triangle disadvantage reduces attack by 20%. 16 damage dealt.
Axe Flier HP: 36 → 20
Axe Flier counter-attacks. Triangle advantage boosts attack by 20%. 34 damage dealt. 
Cordelia, Knight Paragon HP: 40 → 6
Cordelia, Knight Paragon makes a follow-up attack. Triangle disadvantage reduces attack by 20%. 16 damage dealt. 
Axe Flier HP: 20 → 4
Cordelia, Knight Paragon attacks again immediately [Brave Lance]. Triangle disadvantage reduces attack by 20%. 16 damage dealt.
Axe Flier HP: 4 → 0
Cordelia, Knight Paragon is granted another action [galeforce].

Cordelia 3 kills Axe Flier.

STEP SIX - Cordelia 2 Kills Sword Knight

Cordelia 2 moves down 1 space and kills the Sword Knight.

Cordelia, Knight Paragon attacks. Triangle advantage boosts attack by 20%. 22 damage dealt. 
Sword Knight HP: 44 → 22
Cordelia, Knight Paragon attacks again immediately [Brave Lance+]. Triangle advantage boosts attack by 20%. 22 damage dealt. 
Sword Knight HP: 22 → 0

Cordelia 2 kills Sword Knight.

FINISH - Cordelia 3 Kills Bow Fighter

Cordelia 3 moves right 1 space and kills the Bow Fighter.

Cordelia, Knight Paragon gains 6 speed by initiating combat [Darting Blow 3].
Cordelia, Knight Paragon attacks. 18 damage dealt. 
Bow Fighter HP: 59 → 41
Cordelia, Knight Paragon attacks again immediately [Brave Lance]. 18 damage dealt. 
Bow Fighter HP: 41 → 23
Bow Fighter is unable to counter-attack.
Cordelia, Knight Paragon makes a follow-up attack. 18 damage dealt. 
Bow Fighter HP: 23 → 5
Cordelia, Knight Paragon attacks again immediately [Brave Lance]. 18 damage dealt. 
Bow Fighter HP: 5 → 0

Map Clear


Builds

Reinhardt

Reinhardt

reinhardt-thunders-fist [Neutral] -- 4 Star(s)
35 HP / 39 ATK / 21 SPD / 24 DEF / 24 RES
Weapon: thoron
Special: moonbow
Passive A: death-blow-3
Passive B: r-tomebreaker-1

Notes

Pretty much anything works here. Just slap on R Tomebreaker 1 and Moonbow and pretty much any blue mage cavalry should suffice as long as he/she can fall below 50% hp (may have to bring Fury 3 to satisfy this in extreme cases). Just make sure to take off Dire Thunder.

Depending on your strategy you may or may not need to have Spur Spd 1 as well so Cordelia 1 can double the Lance Cavalier.


Cordelia 1

Cordelia 1

cordelia-knight-paragon [Neutral]
40 HP / 40 ATK / 30 SPD / 22 DEF / 25 RES
Weapon: brave-lance
Special: galeforce
Passive A: death-blow-3
Passive B: wings-of-mercy-3
Passive C: goad-fliers
Sacred Seal: Quickened Pulse

Notes

Quickened Pulse is required in order to proc Galeforce without Heavy Blade (not that you would have higher attack anyways). This amount of attack is very precise in that (with Hone Fliers), it's a combo that provides the maximum attack possible that will still allow Galeforce to proc.

Goad Fliers allows Cordelia to buff the other Cordelias for the extra stats they need to finish off the other guys.

If you choose to forego a Hone Fliers on Cordelia 2, then you will need Brave Lance+ and a +ATK boon to hit the same numbers. Aside from that nature really doesn't matter here at all (be sure to downgrade some buffs if you have Hone Fliers and +ATK bane though).


Cordelia 2

Cordelia 2

cordelia-knight-paragon [Neutral]
43 HP / 46 ATK / 33 SPD / 19 DEF / 22 RES
Weapon: brave-lance-plus
Special: galeforce
Passive A: life-and-death-1
Passive B: wings-of-mercy-3
Passive C: hone-fliers
Sacred Seal: HP +3

Notes

To begin with, yes the seal is needed. Cordelia 2 will survive Valter's counter attack with 1 HP. Here we optimize for speed so that Cordelia 2 can achieve 43 SPD with Flier buffs in order to quad Valter. This ATK value also happens to provide exactly enough damage to kill the Sword Knight in combination with Cordelia 1's initial attack.

Hone Fliers is to buff Cordelia 1's ATK and Cordelia 3's SPD. If you want to forego this you can replace this with Goad Fliers, but then you will require a +SPD Cordelia for Cordelia 3 and a +ATK Cordelia for Cordelia 1, as well as upgrading both of their weapons to Brave Lance+.


Cordelia 3

Cordelia 3

cordelia-knight-paragon [Neutral]
40 HP / 40 ATK / 30 SPD / 22 DEF / 25 RES
Weapon: brave-lance
Special: galeforce
Passive A: darting-blow-3
Passive B: wings-of-mercy-3
Passive C: hone-fliers
Sacred Seal: Atk Ploy 1

Notes

Again we are optimizing for speed in order to quad the Axe Flier. Oh yeah, the Atk Ploy 1 seal is absolutely required to help Cordelia 2 survive at 1 hp. Again we are downgrading her weapon so that she can proc Galeforce.

Unfortunately at least this Hone Fliers seems to be required. If someone can figure out a way to achieve this without any Hone Fliers use, let me know, but it seems unlikely since the requirement is to hit fairly high speed thresholds with Brave weapons.


Extra

I played around with some Savage Blow based builds that would allow the Sword Knight to fall under 50% hp so that it would be possible to quad him at that point for a Galeforce proc. However, since that would put him at at most 38 HP, that doesn't seem to leave enough room for a lance flier to kill him AND also kill the Bow Fighter. Maybe a sword flier that can achieve some insane attack stat could pull it off? But it's not clear where this ATK would be coming from since you will need at least 1 Savage Blow proc on the Sword Knight for him to fall below 50% hp.