Re: OOC
You get a knowledge check for free when you first see it, after that you can re-attempt a knowledge check after you level up and put more skill points in that knowledge skill. You can also re-roll knowledge checks by doing research at a library, temple, or anywhere else that may have the correct information. This usually imparts a bonus, but takes 1d4 hours.
Darcon aced his knowledge check when the spirit first showed up and can tell you that it's a variant of wraith. It's main defense is its incorporeality, its attack does negative energy damage and CON drain, with the wraith gaining temporary hitpoints when it succesfully drains someone. The greater wraith is controlling the smaller wraiths, and anyone slain by it is likely to rise as a wraith under its command. He can also tell you that it's severely weakened in direct sunlight.
Darcon also lets you know that he's worried about the trial and feels like he needs to stay in town and do more research, at least until I can confirm that his player is still around and interested in participating.