Tonight's Background

Having gathered some additional allies in the shape of Koshan, a mysterious wizard, Lord Boomish, and Lothar the Firbolg, the party has found the entrance to the Agatheron's lair: a pair of massive iron doors 30 feet high and 60 feet wide.

With the help of Gorp the magical Kobold, the barred doors unlocked and McDagger was turned invisible.  Wolfheir and Arg pushed the doors open a crack to allow McDagger and Gorp to slip inside, and peering in the party saw:

Vast does not begin to describe this chamber. The doorway widens into a hall that is easily one hundred feet across and five times as long. Alcoves are set into the walls on each side of the cavern, covered with great red curtains. Each alcove is flanked by a large torch, filling the hall with a hot orange light. Far in the distance you see a raised dais and an altar of sparkling black obsidian. Five gargantuan fire giants are on the far end of the room, one of them wearing long ceremonial robes and the others carrying massive iron weapons.

In other words....

Experience for last session:
6 Giant worker ants: 720 xp each.