I can't beat the dragon.

In my party I have skilled up The Knight, The Wizard, The Archer,
The Thief and Dwarf.

I don't have the Sorceror so don't have protection from fire. In
order to be able to afford the fire resistant armour, I need gold.

I can only afford it if I sell all my other gear.

I have already explored as much map from new Trelorn as I can, so
all monsters dead, ie; can't skill up the Sorcerer to new level for
fire resist spell.

Help! Is there some treasure or weapon I have overlooked?