[Sandman]

The autocrossbow doesn't sound very good. Why not just buy four crossbowmen?

Fire needs some better items:

Firestorm: Unique fire artefact. It's a bow that lets the wielder cast flaming arrows without gems. Also does hefty damage and grants fire immunity.

Bottled Wisps: Low level fire accessory. This bottle contains a number of wisps which are released when the battle begins.

Elemental cloak: Mid level fire armour. It's essentially a cheaper version of the elemental armour, designed for mages rather than melee combatants.
*edit: This one might be rather unbalanced, now that I think about it. Consider it scrapped.*