Elemental Fury: Fire & Brimstone

From the description: Elemental Fury: Fire & Brimstone is intended for four characters with an average party level (APL) of 15. Characters who complete this adventure should earn enough experience to reach 16th-level. A portal to the elemental plane of fire opens in Dennmarsh. It must be closed or else elementals will invade the city. This campaign takes place in Arden, although it can be set in your own world. Any party composition should be able to finish the adventure with intelligent play.