Build Description
Hint 1 Place center of aura on the little stairs, shrink it so it just covers the crystal.
Hint 5 Place 1 corner on the corner where the 2 stairs meet, then draw the physical beam towards the pumpkin on the corner of the house. But place it down slightly north of the pumpkin otherwise ogres get slightly stuck where fireball's just barely miss.
Alternatively for lower stats, remove northern physical beam and place it in a straight line between crystal close to hint 2 and the main building.