Here’s a random encounter you could toss at your players when they’re on the road. I’d use it as the party is traveling into the dusky evening. They’ll come across the remains of a caravan that was obviously attacked some time previously. They should be encouraged to spend the evening in the area. They need daylight to look for trail of the attackers or survivors. Or it’ll be a few hours if they want to go through the scattered cargo looking for valuables.
Whatever the reason they’re going to be near the caravan at midnight. At which time a phosphorescent glowing form of Ballik Tor will appear in the wreckage. His form shows multiple cuts and covered in blood, one arm is missing from forearm down and and one eye has been ripped from its socket and is still dripping spectral blood. He appears with a scream of anger and pain and glares in fury at any visible party members as part of a surprise round. With flashing purple flash of light he cracks his bullwhip and screams,”Arise and get your revenge boys!” using the Summon the Lost. Ghastly looking spectres will rise up around him and enter initiative on the next round.
The Lost Minions are minions (duh) and while I put the Summon the Lost in as a single use power, feel free to have it recharge on bloodied if during the fight you think he’ll need it.
Ballik will use his bullwhip to position the PC’s as best he can to give the Lost Minions combat advantage and use Command Shout to have the party beat the crap out of each other.
With the light of day the entire caravan and any corpses, loot etc should fade away with sparkles of golden light. 
You can use the images below or you can find [Download not found] and [Download not found] in pdf form at the obvious links.
