After empreya part 2 was released and I used the piercing field spell for balance it clears the field for a second time before staying there.
Also, please, please lower the drop rate for loremaster. People have been farming him for months and never got anything. His chest is just as bad. Morganthe, Mimic, & Omen have a better payout rate than he does and he's only got 7,000 health which doesn't make any sense.
