Herein we find a flaming magma-pit cavern-temple where Hisrathi the evil elemental resides (bottom right on map). Throughout the temple are spiked red-hot iron pillars to which sacrificial victims are chained as offerings to Hisrathi. Also on this level, we find a mine where azers cut crimson kyleth crystals (magicky do-special-stuff crystals) and precious metals to bring to the forges of the flame salamander warrior-smiths that occupy the long angular-shaped chamber near the top left of the map.
Rounding out the level, we have various small quarters and two big chambers for the azers (top left of map) and their boss Utemnaron, nephew of Amaimon, king of azers on the plane of fire. Additionally, there are metal, mineral and crystal storage areas (north of the chasm on the map), and the residences of the highest-ranking members of the Cult of Cleansing Flames (bottom middle-ish of the map), Bayabaset the Burnt Priest, Ignia the Flame Bitch and Vasroth the Impaler.
Of particular giddy referee note is the octagonal-shaped "pinch point" chamber with the four doors: the infamous (in my 3e era Greyhawk game anyway) Brass Gas Room of Doom. Once inside the solid brass chamber, the doors shut fast and a slow-working "knockout" gas-trap activates. Four bronze statues inside the chamber need to be positioned correctly to open any of the doors. A fifth bronze statue in the center of the chamber animates and subdue-attacks the party if the other statues aren't positioned correctly the first time around. It was a great trap encounter since most players hate being captured more than dying. Mwah-ha-ha-ha!
Image download links:
Map 3, Fane of Hisrathi - .png, hi-res
Map 3, Fane of Hisrathi - .png, low-res