VeldalkenBear wasn't suggesting that you (Lord_Bob) have mages cast Solar Rays. His suggestion was to build herald lances, and give them to your non-mage commanders. If they are hasted (W9 bless or equip) then I think the Solar Rays fire faster. And the lances give a morale boost to your front line too.
Anyway, it's better than having your commanders just sitting there doing nothing.
What nation are you playing? You could always hope for this guy. He's not even in a communion! With 16 communion slaves, you could get him up to H14. That should help with your banishment
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