A One-Round Living Greyhawk Gran March Regional Adventure
From the introduction:
It is now obvious that the Vecna-worshiping undead from the Lortmils are not focused on the Dim Forest. A showdown is coming, with Gran March's greatest hope coming from an unlikely ally, and you will be key to stopping this threat once and for all time.
A Gran March regional adventure for [character levels] six to twelve, and Part Three of the "Occluded Whispers" Series.
It is strongly recommended that participating PCs have played at least one of the two previous adventures in this series.
Note: This adventure will be of particular interest to Gran March Army PCs and Members of the Shadowhunters.