Grand Hero Battle - Legion

All units are level 40, five star. Azura is plus 1. Sets are:

Nino: +Hp, -Res; Gronnblade+; Draw Back; Moonbow; Life and Death 2; Axebreaker 2; Hone Atk 3; Atk Seal

Azura: +Spd, -Res; Sapphire Lance+; Sing; Moonbow; Fury 3; Wings of Mercy 3; Hone Atk 3; Fort Res Seal

Reinhardt: +Def, -Hp; Dire Thunder; Reposition; Moonbow; Death Blow 3; Lancebreaker 3; Threaten Res 3; HP Seal

Bride Cordelia: +Atk, -Spd; Brave Bow+; Rally Atk/Spd; Luna; Life and Death 2; Lancebreaker 2; Threaten Def 2; Speed Seal

I started by one shot-ing the right Legion with Nino. Then used Reposition to get out of danger range. I then did my best to stay out of enemy range while cowering in the bottom right corner. I tried using ranged units to kill melee units and Azura to kill ranged units to take no damage. Reposition, Sing, and Draw Back to stay out of enemy range. Unfortunately the battle was too involved, so I don't remember details. The only time I needed to tank hits were Reinhardt taking a red mage attack and Azura taking a different attack (I think from a red unit). Nino and Cordelia were never left in enemy range.

Cecilia/Olwen(can changed with Ursula) /Leo / Priscilla(can actually any Staff Horse
This 3 have ofc all Blade and Priscilla is for Heal buff.
With this Team alone you just one shot everything, Mix the grp with Hone/Fortify Cav and have fun to murder this map.
Give Leo Axebreaker more save give Cecilia Axebreaker too.
This 3 will kill everything under Blade buffs and with Axebreaker on this 2 ensure to kill always Legion. It should be the most esay team to do this map. Be care of Panic Ploy some have it but that can be esay dodged.

I used this team (consisting of all 5* at level 40) to beat the level 30 fight. Not sure about the lunatic or infernal fight.

Sanaki needs axebreaker to ORKO legions.
Start killing legion on the right, move reinhard to the right and sing him with azura to kill the blue mage.
Next turn bring back reinhard to kill the new blue mage or use hector and sanaki the new legion, after this the game is straightfoward, hector bait and kill all units thats not legion ou red mage, sanaki kills legions and reinhardt cleans up the remains.

Infernal mode -
Nino with Reposition and Desperation. Tharja with Axebreaker (any level). Naturally, try and keep units around Eirika for her buffs.

Start by ORKOing the Legion to the right with Tharja and repositioning her with Nino, who then counter kills the mounted blue mage. The red mage can be easily dealt with by Kagero. Desperation Nino takes care of the archer and any further blue mage reinforcements.
Additionally, be wary of the leftmost Legion with Aegis.

The rest is careful positioning and letting the units come to you, who can be dealt with by Tharja alone or a combination of Kagero and Nino (and Eirika if need be).