The continuing adventures of my Tuesday night game.
The collector show the party his gemstone gate in the basement. Using the gemstone gate the party teleports to a location the collector assures them is near the City of the Frogs where the last remaining artifact, the sphere, is hidden. After stepping through they enter a 20x20 room with no obvious exits, and lament the fact that no asked the collector for the correct gem stone combination to return to his lair. A quick search reveals a secret door to the north. The door opens into an ancient frog man tomb (please note my frogmen are much closer to the eldritch las pistol wielding slann of old warhammer fantasy, than the obnoxious but not very powerful bullywugs of D&D). After defeating the mummy within they solve a devious puzzle to open a secret trap door in the two step pyramid. This of lead to five foot hall ending in another secret door which entered into 30 wide vaulted tunnel associated with the great underground road. There was also a drow hit squad waiting for them. Clever use by the Druid of a wall of ice from the staff of cold he borrowed from she-who-must-be-obeyed (she-who-must-be-obeyed is on break until we find another Tuesday sitter) cut down the range advantage and the fighter made short work of the assassins in melee. Following the road north lead to its end in a pair of double doors.
Opening the double doors leads to a six chamber room complex with no apparent further exits until umber hulks Kool-Aid man through the walls (or maybe its Kool-Aid man umber hulks through the walls, umber hulks have been a D&D staple since 1976, I was bit surprised some of my players has not seen this before). Its pretty touch and go (the tank kept staring into those googly umber hulk eyes) until the sound of a flute is heard in the distance and one of the two umber hulks wanders off. They dispatch the remaining umber hulk,and begin to follow a trail of broken walls left by the umber hulk which wandered. They cross a long corridor only to hear the bwang of a ballista being fired leading them to hurry across before it reloads. After following the broken walls parallel to the long corridor, they catch up with the umber hulk and a small blue kobold with a flute who have just broken through the wall to attack the frog man ballista crew, A wild three way melee ensues. However, while the melee between the party the frog men and the umber hulk continues, the kobold slips past to the double doors and the end of the long corridor that the ballista crew guards. The kobold sets up a tripod holding a small red gem, picks the lock on the double doors and slps into the chamber beyond.