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Source Underdark Adventure Guide
Umbrite is a dark, dense metal of surprising hardness. While umbrite is no match for the hardness of mithral or adamantine, it is stronger than steel and easily among the most durable metals known. Beyond its capable performance as a metal, umbrite is remarkable for its light-absorbing qualities.
Umbrite seemingly absorbs light at a slow rate, causing shadows around it to deepen considerably. In fact, veins of umbrite are often located by noting areas incurring a sudden loss of light.
Strangely, umbrite is a relatively new discovery, having first been written about within the last 200 years. When the first reports of this material were made, they were dismissed as hallucinations produced by the subterranean gases. This may be one reason umbrite has remained unknown for so long. Umbrite is only found during mining operations for other ores or rare gems, and even more curiously, only in the deepest and darkest locales where few civilized folk venture. One drow archmage has theorized that umbrite may well be a new material. Its appearance and location may be linked with the little-known fact that it only appears near large concentrations of the strange radiations that are said to power many of the enchantments of the drow. Other learned folk have speculated that umbrite might be seepage from the plane of shadow. Many agree with this theory, since umbrite is only found in places of deepest darkness.
Miners have long maintained that umbrite is an unlucky material and bodes ill. Stories abound of miners disappearing frequently after a vein of umbrite has been uncovered. Miners have considered it a nuisance material for decades, since until recently it was impossible to forge umbrite into any useful product.
Duergar apparently possess a process that allows the forging of umbrite. The underdark races have begun vying to learn this secret and, more importantly, to gain control of umbrite mines of their own. Umbrite-forged items are immensely expensive. A forged umbrite item weighing 1 pound or more retains much of its light-absorbing properties. While wielding any umbrite item of 1 pound or more, the user gains a +3 circumstance bonus to all Hide checks. Shadows around him seem to be deeper and darker. This affects a 5-foot area around the wielder and does not extend to others.
Material Cost Modifier Benefit
Umbrite x300 +3 Stealth bonus
Q1) If I own the Underdark Adventure will I be allowed to buy an umbrite dagger for PFS play?
Q2) Does the umbrite dagger give me a +3 Stealth bonus for checks involving being noticed while scouting?
Q3) The cost for a masterwork umbrite daggar would be 2x300 + 300 = 900gp correct?
1. Absolutely not. That's 3rd-party material.
2. Hide is part of the pre-conversion version of Stealth, yes.
3. Yes.