I found this fight fairly straight forward and quite a bit too easy on normal settings using level 21 characters. Two of my guys were set to be total brutes hack 'en slashers. The archer knew the minor hp recover skill and could summon ice and spiders. I used the mage to also summon other elemental placing them in the front line. The archer would use some charm arrows on the dragons summons. I had to heal Astroge once. My brutes laid it into the dragon hard and the archer used some scrolls and silver tipped arrows to weaken him. When every one was healed up the mage would drop a poisoned rock from the sky or a small fire ball using the archer's silver tips would help as well. Air seemed useless against the dragon but once weakened he could be stunned but may end up wasting your ap if trying to stun him soul sap seemed to help as well.

Scarlett archer

Strength 15 | Damage 192-336
dexterity 13 | Armor 163
Intelligence 10 | Critical chance 9%
Constitution 8 | Offence 121
Speed 9 | Defense 124
Perception 8 | Vitality 1432
Action Points 9

Weapon: Salved Bowyer's Composite Bow of the Master
Piercing 82-142
Air 25-43
Tenebrium 25-43
Strength +2
Dexterity +2
Leadership +1
HP +74
20% Stunned

Rodrick Two handed man of arms

Strength 20 | Damage 469-934
Dexterity 7 | Armor 192
Intelligence 5 | Blocking 0%
Constitution 9 | Critical Chance 16%
Speed 11 | Offence 163
Perception 9 | Defense 94
Action points 9 | Vitality 1416

Weapon: (crafted) Superior Two handed Axe
Slashing 236-471
Tenebrium 71-141
4 Action Points
Critical Damage x2.0
Critical chance 5%
Strength +2
Dexterity +2

Madora Two handed man of arms

Strength 18 | Damage 375-950
Dexterity 7 | Armor 202
Intelligence 5 | Blocking 0%
Constitution 10 | Critical Chance 11%
Speed 10 | Offence 154
Perception 8 | Defense 98
Action points 8 | Vitality 1507

Weapon: Fatal Sharp ornate Scythe of the Fire Band
Slashing 155-393
Fire 46-117
Tenebrium 46-117
Critical Damage x2.0
Critical chance 5%
Strength +2
Dexterity +2

Jahan

Strength 11 | Damage 57-138
Dexterity 10 | Armor 135
Intelligence 18 | Blocking 0%
Constitution 13 | Critical Chance 8%
Speed 7 | Offence 148
Perception 9 | Defense 113
| Vitality 2550


Weapon: Concrete Mystical Earth Staff of the Colossal
Fire 5-13
Critical Damage x1.5
Strength +2
Dexterity +2
Intelligence +3
Constitution +3
HP +101
10% chance to set petrified
15% Chance set Mute