It's impossible to play on Hard

[loreangelicus]

Hmmm... given that you are a mage, what offensive spells do you have at your disposal?

Try this lineup: archmage (verona), paladin (verona), guard droid (bolo), repair droid (bolo).

This is a survival lineup, with the only real damage-dealers being the paladin and guard droid. Given that you are on Hard, I assume you have either (or both) Ball Lightning or Dragon Dive. Split the repair droids into two stacks (since they can't repair themselves if only one stack). Guard droid and paladin as tanks, archmage casts mage shield on whoever is being attacked more. If necessary, even the two stacks of repair droids could do some minor tanking since you can "resurrect" them with their repair ability (which is a reload ability, thus could continue ad infinitum).