C7 - C12 (Skull's Watch)

The trolls have bunkered down within Skull's Watch. They leap into battle as soon as someone enters the room. I suggest the following encounter for a party of five adventurers:

• 1 Troll Witch (see Dragon #366)
  
• 1 Spitting Troll (see Dungeon #161)
  
• 2 Trolls
• 2 Cave Trolls (see Dungeon #157)
  

Total: 2,600 xp (Level 10 Encounter)

The trolls are a versatile bunch, and they know their strengths. They keep as close as possible to each other in order to maintain their regeneration while under attack. If someone begins consistently using fire or acid attacks, the trolls unite their efforts to bring that character down.

You should consider increasing the size of area C7 to provide more room for the fight to play out in. Making the room a couple squares wider and longer ought to do the trick just fine.

Area C9 contains the following treasure: the cracked emerald worth 400 gold pieces, the behir comb worth 900 gold pieces (both together treasure parcels 9 and 10 from level 10), and treasure parcel 3 from level 10.