A white dragon solo build.

For the dragon solo, before the fight, you can get buffed up by your teammates,

but in the boss fight, no one could help you (guard from lord to share damage, bards encourage, or defense are all prohibited). You lose all the teammates when you actually are facing the White Dragon.

Here is the buffs I think to buff on before the solo.

For AC:

Wiz's IMA +6 armor AC

Wiz's Spider skin  +5 Nat AC

Cleric's shield of faith +5 def AC

Cleric's magical vestment +5 shield AC

Recitation 2-3 AC (60 round by a decent caster)

For AB:

Cleric :  Bless 1, Aid 1, GMW 5, 

              recitation 2-3, prayer 1 (60 round) 

Bard/Wiz: Great Heroism 4

                  Haste 1

For dmg:

The best is Holy Sword by an extended caster Paladin. (2d6 holy)

The acid is good (only AK has acid weapon I assume)

He is immune to fire and frost, so druid might not work well.

Will work on the build later.