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Yes, you have to talk to Tolgerias first to trigger the quest. But I wouldn't recommend killing Valygar to enter the Sphere - you'll gain MUCH more experience if you add him to your party and do his bidding. The item Tolgerias promises you for Valygar's body will be obtained anyway (through a fight, though!) And if you don't like Valygar, just dump him somewhere after the quest.
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