I found the easiest way was to poison the hydra. I used my poison bombs, and had my former priest cast all her venom bite spells at the hydra. Surprisingly they work each time, and each time you hit, the amount of poison damage the hydra will take increases by one. Of course this takes a little time. I had the hydra taking about 45 points of poison damage before it finally keeled over. But wow it was easy. Used no other spells, no wasted potions except for too more mana potions, and only cost 15 minutes of my life. I tries the melee way, and I came close though.
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