[--Chris--]

Maybe each class should have one special ability?

Alchemist - Only to be capable of using alchemy skill + spell.

Priest - Only capable to bless weapons (all other classes however can still pray.)

Barbarian - Only class capable of using woodlore (id organics.)

Warrior - Only class capable of using smithery (id weapons.)

Thief - Only class capable of stealing.

Definately would distiguish classes, majorly encourage player co-orperation (along with a need for each class in kingdoms) and the economy as players could pay for their services.