Will O’Wisp: Dying Breath

Will O’Wisps are fearsome undead-spirits that seek vengeance on the living. They can harm mortals but are immune to physical attacks and magics that are not spirit based (Exorcism, Spirit Shield, or weapons that effect intangibles).
Usually Will O’ Wisps try to mislead travelers to some horrible hazard like the sand of a quick mire or a deep dangerous bog. See the Will O’Wisp once was alive, like you or I, but it drowned somehow and then returned from death forever determined to reenact the scene of its own demise with the use of new victims. To lure victims closer to the water, the Will O’Wisp has hidden stashes of gems in water and then left a message of the stashes whereabouts trapped in their dying breath. The Will O’Wisp coalesces its dying breath into a glass orb and places it into a chalice to sustain its power. The message of where the treasure is buried remains trapped in the glass orb. Shattering the orb will do nothing but the message can be heard if some type of communication / listening spells such as Thought Transfer or Clairaudience is cast. The message will direct the finder of the Dying Breath where to look of course they should keep their eyes peeled for lurking Will O’Wisp.
Those Will O’Wisp who died in wetlands but did not drown produce clear bubbles of the Dying Breath. These work in the same fashion but the cache of gems is hidden somewhere up high. Mainly this is because these Will O’ Wisp delight in watching greedy mortals plunging to their death. Evidently, the Will O’Wisps stalk and attack these mortals while they climb to get the hidden gem caches. Although a good profit can be made from the Dying Breath of Will O’Wisps beware being tom greedy or your dying breaths may join theirs.