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Let's think about who should take on whom. In our group of three, we have a tank, a semi-tank, and a ranged damage dealer. But I wouldn't send Kosh into melee combat with a hydra, but Hommi could. But then we need at least one more damage dealer, and Kosh can provide support.
Regarding the mage, I said that stasis probably affects him. Even if it doesn't, he probably doesn't have enough health to survive one or two lightning bolts. So, I can handle this alone or with a little tanking support.
I don't know how to approach the dragon.