The Deep Magic dungeon is the Sorcerer gold challenge. It uses the depriciated layout of the old Vanishing Oasis map, except fully flooded. It is similar to the Doubledoom and Dragon Isles layouts, but it is significantly less cramped and the peripheral islands aren't all conected to the central one. It uses the northern (hieroglyphs) tile set.
Animated Armour: Magical Attack, Death Protection 1/level
Bloo Goo: Physical resist 50%
Desert Troll: Cowardly, Fast Regen
Djinn: Magical Attack, Retaliate: Fireball
Monster difficulty corresponds to Normal difficulty (100% of nominal Attack and Health).
The initial boss of the dungeon is The Undefeatable ( Animated Armour icon, Attack 999, Health 159, Magical Attack, Death Protection 33, Revives).
Once defeated for the first time, he revives, and has the exact same stats over again, except that he no longer has "Revives". When defeated for the second time, The Undefeatable is finally defeated and drops the Blue Bead.
The recommended race: Gnome.
Initially the boss has a high Attack score, which makes melee approaches suboptimal. The first 16-17 layers of Death Protection need to be peeled off via magic. After that, his Attack goes down enough to make melee possible. Try to defeat the first form without using up any of your transient resources, as this ensure that you will be able to take on the second form even if you have little blackspace left.
You can experiment with Binlor or Tikki Tooki, however for the recommended approach playing a Gnome Sorcerer, Mystera Annur is enough. Just pick up , , and two levels of , which should be doable whether you find her early or late.
To make the most of your resources, set up for the boss fight by leaving a couple of monsters around. This allows you to - once the initial health of The Undefeatable is depleted - remove two layers with each BURNDAYRAZ by immediately hitting another monster while the boss is Burning and at 1 Health. Try to leave low-damage monsters for this purpose, to make sure you can repeat this several times. You can also regen a bit between castings; if you're Level 8, your fireballs do 32 damage, so you can uncover 3 tiles before casting BURNDAYRAZ (this puts The Undefeatable at 31 health, just shy of the damage you deal). Once about half of the Death Protections are gone, you can start melee fighting, which is great as your takes out another Death Protection.
Once the boss Revives, you can start to use up your resources. Converting a single glyph gives you 10+ Mana via , plus a Mana Potion that will give you another 8+ Mana, altogether enough to cast 3+ new Fireballs. So even if you have no more monsters left to bash between fireballs to remove double the Death Protections, and very little blackspace, you should still have enough resources kill him once over again. Buying stuff like a Schadenfreude potion, or anything that helps you cast more spells (Dragon Soul, Pendant of Mana, Crystal Ball, Keg of Mana, etc.) will improve your chances even further. If you have the boss next to some walls or another monster, PISORF can be even more efficient than BURNDAYRAZ in removing Death Protections.