I can't confirm this as a guarantee, but I farmed on 3 characters for this guy in one evening. On 2 of the characters, the zone was phased and I didn't see any wisps. On the third, he had not completed any quests in the zone and they were abundant.
If you're having trouble, try using an unphased character.
I can't confirm this as a guarantee, but I farmed on 3 characters for this guy in one evening. On 2 of the characters, the zone was phased and I didn't see any wisps. On the third, he had not completed any quests in the zone and they were abundant.
If you're having trouble, try using an unphased character.