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Boss: Firstborn, Matron of Flame
Defeating the Firstborn will unlock the path to the Lair.
The Lair is a narrow corridor that starts with two Dragon Guards flanking a wall that vanishes if they're defeated, followed by four Dragon Elites and finally the Matron of Flame.
The Matron drops Dragon Shield instead of a trophy, but The Firstborn drops a dragon scale as normal. Although the dragon scale is the only trophy in the dungeon, you may choose to sell it for 25g, but you can also leave with it and sell it to the taxidermist.
After the interminable curse-corrosion-weaken trifectas of most Vicious dungeons, this is a fresh breath of air. Prefer HALPMEH to PISORF or BURNDAYRAZ, as there are no walls and the Matron retaliates. The final gauntlet can be bypassed with a single use of a wall-breaking ability and WEYTWUT to leap over the other four enemies.
Assassin - Play competently enough to reach level 10 in the main dungeon (A Balanced Dagger, the Goblin race or worship Dracul/Tikki Tooki may be useful); this will allow you to make short work of the Matron's escort and handle her as you would handle a slightly lighter-weight Super Meat Man.
Berserker - The berserker trivializes the first half of the dungeon with his magic resist. If you save enough popcorn, you can use that magic resist for the matron as well.
Crusader - Resists such as the Dragon Shield's are nearly useless for other classes in the lair because of the curse bearers, but not for the Crusader! Keep some level 1 and 2 enemies alive to build momentum and truly show the dragons the meaning of pain.
Priest - If you already have the Naga Cauldron from the Naga City, you can see just how much HP a Halfling Priest can accumulate. A Trisword helps too. If possible, limit resource use with the Firstborn by using APHEELSIK.
XXXX - Complete Dragon Isles with any 3 classes. Unlocks the playable Half-Dragon monster class.