Iron Spider

A mechanical spider costing 20,000 G.P. in materials and able to take 30 H.P. of damage. One mechanism lets it spin as much as 100 sq. ft. of webbing made of metal, and another gives it a poisoned bite like an iron cobra's. It attacks as an 8th level monster, bites for 1-8 points of damage plus poison, and has armor equal to chain mail.

Machina are intricate, machine-like constructs of iron built to resemble various creatures, with mechanisms that imitate the abilities of the creature they copy. Building one takes a large workroom, a full set of metal working tools, 4 months (16 weeks) and a fluid ounce of aqua vitae to bring it to life; it cannot be done without an alchemist or a scholar skilled in both engineering and inventing. The chance of success is 55%, or 80% with a hired engineer, sculptor or scholar, who also halves the time. Machina are immune to non-magical weapons, poison, heat and cold (though lightning does full damage), move like the creature they resemble, and either follow up to three programmed commands or obey their master's spoken orders.