Deathpriest attempting to open the rift under the Keep
Cleric who worshiped a dark demonic lord, Kalarel was responsible for the cult activity at The Keep on the Shadowfell. He ultimately sought to re-open the rift below the keep, creating a permanent bridge to the [[Shadowfell]].
His plans were ultimately foiled by the PCs, who interrupted his ritual just before it was completed. They defeated Kalarel and his undead servitors in battle, casting the priest into the portal he was trying to open before destroying the magic circle keeping it opened.