Plaguesmith
Plaguesmith can be found in the following locations: Pits of Inferno, Formorgar Mines, Edron Demon Forge (The Vats, The Foundry), Magician Quarter, Alchemist Quarter, Roshamuul Prison, Grounds of Plague and Halls of Ascension.
Plaguesmith has 8250 hitpoints. It is immune to earth damage. It is strong against fire, ice, and death damage. It is weak against energy and holy damage. It can neither be summoned nor convinced.
Plaguesmith yields 3800 base experience points. Its loot can include emerald bangle, silver brooch, gold coin, small amethyst, platinum coin, axe ring, club ring, piece of iron, mouldy cheese, dirty cape, two handed sword, war hammer, morning star, battle hammer, hammer of wrath, knight legs, steel shield, steel boots, piece of royal steel, piece of hell steel, piece of draconian steel, soul orb, demonic essence, onyx arrow, great health potion, and slightly rusted armor.