Black Lore of Moil( Complete Arcane, p. 75)
Your study of the sinister knowledge and spellcasting techniques of the long-dead Nightlords of Moil makes your necromancy spells especially potent.
Spell Focus (PH) (necromancy) , caster level 7th,
Any necromancy spell you cast can be cast instead as a Moilian spell, dealing an extra 1d6 points of negative energy damage +1d6 per two spell levels (+1d6 for 1st-level spells, +2d6 for 2nd- or 3rd-level spells, and so on). If the spell normally allows a saving throw, the target takes half the negative energy damage on a successful save, regardless of the outcome of the save on the spell's normal effect. In addition to its normal spell components, a Moilian spell requires the creation and expenditure of a Moilian runebone— a small human bone (often a finger bone) scribed with carefully prepared arcane markings. Only a character trained in the Black Lore of Moil knows the secrets of creating a runebone, which takes 1 hour to craft and requires special inks and powders costing 25 gp per die of negative energy damage to be generated. For example, a runebone capable of adding 3d6 points of negative energy damage to a spell costs 75 gp to craft. While the maximum negative energy damage dealt by a Moilian spell is based on the spell's level, the actual damage is limited by the runebone. For example, if a sorcerer casts fi nger of death (a 7th-level spell, so normally +4d6) with a 75-gp (3d6) runebone, the spell deals only 3d6 points of additional negative energy damage. A Moilian spell uses a spell slot of the spell's normal level.