SPOILER
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If you have a staff of cloudkill(and you donīt mind about the cheesy tactic), you can easily kill the beasts. Just approach until they nearly see you, then cloudkill īem. They will not come closer and heal themselves 2 or 3 times, but after about 8-10 clouds, the battle is over. I know itīs a bit

, but I never tried another way.
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-UCANTZEECALIFORNIAWITHOUTMARLONBRANDOSEYEZ-