The adventure

Karen, Shu Ting, and RFS were about to step through the entrance when Quentin spotted that one of the metal plaques surrounding the doorway was hinged rather than simply bolted into the wall. They set Salva on the job, but the plate opened without incident. However, underneath it was a complicated mechanism with a number of traps set to trigger if someone fiddled with it. Salva fiddled with it, but with the traps first, pushing a few levers and disconnecting some crank rods to see what might happen.
The bubbling sound stopped and they saw that the two lava pools had drained away; they could only assume that the whole antechamber had been a trap to drown people in lava.

They passed through carefully and safely into another hall with a statue of a four-armed demoness facing them from an alcove. Two ramps led up the sides of the tall room to a platform above the alcove, which stretched beyond their view. Salva's scanner showed rapax further ahead, presumably up the ramps, but Quentin decided to have a look at the statue.
AS well as finding some of his special healing powder hidden behind her, he also got a good glance of the careful artistry of the naked statue.
"She is rather fine, isn't she?" admitted Margreet, coming over for a look.
"Oh come on!" exclaimed Karen, "Haven't you enough to ogle?" She spared a glance for Vi, who was quite innocently unaware of anything other than a search for hidden items.
Margreet had a grope of her own of Al-Sedexus' behind, picking up some potions from the other side from Quentin.
They sneaked up one of the ramps, along a wall of the cave that extended along behind the platform, and to two protruding pillars, behind which they hid as the enemies approached, chanting some strange hymn to their demon.
As the sound of footsteps became audible, along with the rhythmic chanting, they could judge without Salva's scanner when the leap out.
They ambushed the procession, led by the high priestess, and Shu Ting did for the matriarch, yet again displaying her profound respect for religious authority. The five priestesses remaining required simple butchery, which the friends were happy to give, Shu Ting bagging another couple, giving her three of the six.
"Those were very neat decapitations." Quentin observed, looking at two heads of the high priestess and one of her initiates. "It takes the phrase 'the head of the church' to a whole new level."
Shu Ting snorted.
The high priestess had been carrying a staff of flame, which Margreet eyed greedily. No-one else laid a claim to it, so she swapped her ebon staff for it, the new weapon being hugely better; a truly powerful artefact.She had also had a small wand, a flamequencher wand, from its effect on the staff, which they kept.
They sorted through some of the metalwork that they had accumulated, finding that some of the gauntlets were mildly magical 'Mantis gloves', which Karen and Vi decided that they could use. They picked up a helm of insight, that aided psionic powers, but Quentin declined to swap it for his brilliant Brilliant Helm. Vi swapped some of her plate mail for slightly better-looking versions, and they packed the rest up carefully for carrying home.
Salva successfully disarmed the anti-magic trap on the first chest, but tripped the curse on the next one seven times. The friends appreciated the aid of the regenerating stone, but the smell of burning, dripped flesh that accumulated on the ground around them became quite pungent, so they were very glad when he finally prised the lid open. The chests held nothing of interest, very frustratingly.
Weighed down by their load, they followed another corridor from the balcony down, past two sentries and to an island in the lava where a staff was locked in a cage of fire.
"That's it!" said Salva
"That's what?" asked Quentin
"They go to all this effort to lock it up, so it must be valuable!"
"Or dangerous." pointed out Shu Ting, but Margreet had the flamequencher wand, and, accompanied by Karen, she used it to suppress the flaming cage. Quentin strode over and grabbed the staff as the ground started shaking.
"What have you done?!" shrieked Vi
"I hope it's not erupting" Salva agreed.
"This is worthless" declared Quentin "It's just ash."

The shaking began to differentiate itself into separate thunderings, like individual impacts, and they were interrupted in their worrying about an eruption to find themselves facing an angry giant of crusted lava, the red of the molten rock glowing softly through the cracks of his body.
"He needs to come to the gym with us." was all Quentin could manage to utter, eyeing up his wobbling pot-belly. At the thought all fear he might have induced dissipated, and they attacked the beastie, who summoned three fire elementals to join him.
Quentin used the potent fiery magic of the place to cast a powerful spell that magically sped them all up, and they easily avoided the ponderous sweeps of his club, or his searching feet, and chopped him up, knocking pieces of half-solid rock out of him a little at a time.
He died slowly, it seemed, to them, but actually quite quickly, and the fire elementals they finished off afterwards.
They found that they were cut off from everywhere else by pools and streams of lava, so they returned to the two portals, where Quentin, who after some examination had worked out how to turn his magic to this teleporting trick, set his homing mark. They took the second one, appearing in front of a sealed stone door with a strange indentation in it, and capped by a magnificent golden statue of a demon, very much like Bela.
Remembering the door to the meditation room in Trynton, they tried a faintly magical artefact they had picked up from their trawl through the holy complexes which called itself, rather ominously, the beckoning stone. Its unengraved side fitted the indentation perfectly, and immediately the cliff face in which the great stone door was set began to shed rubble, driving them back.
From a small distance they could see the golden statue raise its arms, the cracking sound of its magical joints echoing across the rift, and leap down in front of the now open stone door.
El Dorado wasn't a hard fight at all. Gold is much softer than steel, and less painful than drips of lava. Salva did need to use the regenerating stone once, but they'd have killed it anyway. When Bloodlust finally bit some more gold away to reveal where a heart might have been the golden monstrosity creaked and fell, shattering into fragments that scattered into cracks and crevices. They retrieved a few gold nuggets, but much of it had vanished, perhaps into the lava.
They peered into the chamber revealed by the open door, and saw inside a beautiful round room, separated into an inner circle and outer circle by a colonnade of giant pillars, the demonic form of Al-Sedexus, the demon goddess, herself. They had left Demonsbane in Arnika, and she seemed unaware or unconcerned by the light streaming in through the doorway, so they sneaked away, killing 4 rapax soldiers on the way.

As they came to an archway, they realised that this was leading to Rapax Castle, and they decided to unburden themselves before infiltrating such a formidable place. Margreet teleported them back to Arnika, via her homing site at the T'Rang teleporter in Marten's Bluff.