there is one bug, if you are on the map with the sun ray and you use it but the target ties b4 you are able to click on it you can not un use the sun ray and u are forced to wait until the next round starts.
Best combination in my opinion is the paladin and shielder, start off with pally's wisdom aura and shielder's protection of the pally. Then proceed to beat face with the pally and stack thorns and reflect. This method proved to be slower than most but I never had a problem dropping all the bosses in the first try. You might need to heal every now and again with the pally, and the shielder's special of the invulnerability is a must.
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You can cancel the sunray with the Space Bar. as well as Rally Point or any Other Special Power.