Possessed Weaponry

Roughly two hundred years ago the Arch-Mage Tresmetheous produced several dozen weapons possessed predominately with various demons and devils though a few contained elementals. As one might guess Tresmetheous specialized in summoning and binding beings to his control. As these types of stories often go, it was one such summoning that was his undoing. No one knows if he had made some mistake in the containment circle or perhaps it was a slip in the summoning itself that attracted something of great power. All that remains of Tresmetheous' huge castle are crumbling, scorched walls and a debris field that stretches a quarter mile.

The possessed weapons come in many different varieties but all are marked with deeply cut red glowing runes. Powers of the weapons also vary based on the type of entity trapped within. These entities are bound to the weapons for 99 years. When the 99 years are up they are released and have free will. Once the blade is empty it reverts to a +1 weapon. In its empty state it can again be the vessel of an extra planar being if it makes the killing blow against such a being. When this happens the being is prevented from returning to its plane, its essence sucked into the weapon if it fails a save vs. RSW at a -6. The sword mimics the conduit by which the beings essence would return to its native plane and is therefore not subject to a magic resistance roll. At this time the weapon will exhibit new magical powers drawn from the being within.

Several of these weapons survive to this day in the possession of various adventures or well guarded treasure troves. It is rumored that Ke' Leorn of Ascutholl holds such a weapon and there is a certain devil counting the days until its inevitable release. Its hatred boils like molten lava pouring into a subterranean ocean, compounded by each year of its imprisonment.