Encounter: Undead Trolls

Encounter Level Difficulty: Standard (3000 XP)
5 PCs Party Level 10

Setup
Illumination: The trolls having darkvision tend to live in the dark and do not have any light sources in here.
Rubble: The rubble (blue dots) is considered difficult terrain
Stalactites/mites: These can be used as cover form the war troll
Bridge: the bridge is covered in water, and extremely slippery. Any PC moving over the bridge requires a DC 22 Acrobatics check. If the PC fails by 4 or less they fall into the underground river and are swept away.
Underground River: PCs can attempt to jump the underground river, failing by 4 or more causes them to fall in. PCs have a forced movement of 6 squares a round. And need to make swim checks DC 18 to stay where they are.
Treasure: The vampire has 1 black pearl (500 gp)

This encounter includes the following:
(T) 3 Boneshard Troll Skeleton – Level 11 Brute, 600xp ea
(S) 1 War Troll Vampire Lord – Level 11 Elite Soldier, 1200xp

Tactics
The WTVL will stay on top of the rock and fire arrows and use dominating gaze for the first round or two using his combat advantage. He is standing on a pillar. He waits until a PC decided to pick on him, or is singled out. When he moves towards the target, the BTS put themselves in-between the WTVL to make it harder for the party to get to their companion.