Which dragon should I put at the Center of my army in Dragonfire?

The Center is the aura hub: the aura of the dragon placed there spreads to the whole army. That's your team multiplier — don't waste it on a plain hitter.

How to pick your Center:

1. By default: a Champion. They have the best auras on average. The absolute benchmark is Rhysarion *Ebbing Fury*: −27.5% enemy damage (plus Recovery, +45 troops per dragon per round). It's the strongest aura observed.
2. If you want Initiative: a Warrior (*Battle Rush*, +25% Initiative to allies).
3. In a mini-fight (1-2 rounds): aura duration matters less — put the biggest raw burst there instead.

A practical roster problem: there are only 4 Champions (Rhysarion, Seasmoke, Kalspire, Feskar) for 5 armies → the 5th army won't have a true aura Center. So reserve your Champions for the armies doing the heavy lifting.