Elemental Chaos takes place in the lair of Alius, a wizard who has gone mad with ambition. Deep underground, he has been experimenting with pulling more and more powerful forces from the Elemental Planes. Constantly tearing open portals to other planes has caused the barriers between them and the Prime Material Plane to weaken. Stray elementals have been crossing over and wrecking havoc in nearby towns. Without intervention, there's no telling how much damage might be done, how many lives lost. The party must navigate through Alius's lair quickly as the elementals crossing over grow more numerous and more violent with each passing day.
Unbeknownst to anyone, Alius succeeded in his goal of summoning a creature long thought to be mere legend: a Chaos Elemental. Upon seeing it, Alius knew he had made a mistake, but he couldn't dismiss the creature before it mortally wounded him. Alius now lies dead, unable to banish the monster he summoned, and it's only a matter of time before the Chaos Elemental escapes the cage in which Alius imprisoned it.
Elemental Chaos is an adventure designed for a party around level 6 that should take roughly 3 sessions to complete.