Nagor's heavily armoured form absorbs the blow effortlessly, and he turns his faceplate towards you, following your movements.
"Ah - not Roost, but his son. So much for the thoroughness of dwarves.
"No matter. You will be dead soon enough, and the prophecy with you."
The armoured figure raises one gauntlet, clenching it abruptly into a fist. At the gesture, a torrent of crimson flame - familiar to you from your last duel with a Knight of the Eternal Vigil - erupts in a 40' circle in front of Nagor, encompassing the Lifewardens, Lothrain, and the Vanguard - and you. Innocent men and women in the process of fleeing are caught as well, screaming as their bodies turn to ash. Even the proprietress does not escape, her life snuffed out in a callous instant by the creature she called to defend her.
Spoiler: Abyssal Blast
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27 damage, Reflex DC 17 for half. Damage is 50% fire, 50% untyped.
All but two of the junior Lifewardens fall, crying out as the fire burns their flesh. A swift response by Eldan, their commander, sees a third survive, his burns healing as quickly as they form; Eldan himself is quick enough to avoid the worst of the flames, but still has blisters over half his body. Eldan wastes no time, however, bounding past you to confront the vampire courtesans on the stairwell, healing himself as he goes.
Lothrain raises a hand in a gesture of denial, and the fire parts, flowing around him; but a sickly cloud of black energy seeps over him, causing him to grimace with pain and distaste. Hefting his sword, he rushes one of the enemy mages and attacks, dealing a heavy blow; the mage falters in his concentration briefly, but drags the spell back under his control.
Of the Vanguard, Lydia manages to duck beneath the worst of the flames, although still suffering from the heat. Althazan seems initially untroubled by the blaze - but, like Lothrain, soon learns that there is more to this attack than fire alone.
They each focus on the enemy mages. Althazan barks a counterspell, and one of the trio staggers, clearly feeling the magic he was gathering dissipate. Lydia attacks another, sending a pair of fiery lances towards him from her free hand; one misses, but the other proves to the mage that it is not just the undead who can play with fire.
Even injured, the mage continues his incantation.
Atop the stairs, the three vampire courtesans smile in predatory fashion at Eldan. No visible sign marks the ensuing struggle, which takes place solely in the mind - but, a few seconds later, Eldan sinks to the floor.