One of my favorite characters I ever played was Lyle, a halfling necromancer that hates undead. He excelled at taking down ability scores and using many unconventional spells to great effect. This would have been a spell he would have loved to use.
Necromancer’s hammer was originally in the Inner Sea Magic Player Companion and was named for a major necromancer in the setting. That is just one of the 26 books with all the spells within incorporated into the Book of Magic: Spell Codex 3. A total of 166 spells from various sources all in one place.
Download the Book of Magic: Spell Codex 3 at DriveThruRPG and coming soon to the Open Gaming Store, and Paizo.
School necromancy; Level arcanist/sorcerer/wizard 4, spiritualist 4, witch 4
Casting Time 1 standard action
Components V, S, M (a leather glove coated in dried embalming herbs)
Range close (25 ft. + 5 ft./2 levels)
Effect sphere of undead remains composed of 3 or more destroyed undead
Duration 1 round/level
Saving Throw none; Spell Resistance yes
When you cast this spell, you draw the remains of nearby destroyed undead together and fuse them into a mass of flesh and bone you can then hurl at any foes within range. Three corpses within range of the spell are required for the spell to function. Necromancer’s hammer can be directed to attack one foe within range per round as a move action. It uses your caster level as its base attack bonus, modified by your Intelligence, Wisdom, or Charisma modifier (whichever is highest). On a hit, the corpse hammer deals 1d6 points of damage per three caster levels (to a maximum of 6d6 points of damage).
Necromancer’s hammer also has secondary effects based on the nature of the three bodies you use to create it. If the majority used to create necromancer’s hammer (at least two) were skeletal, the jagged bits of bone cause the corpse hammer to deal slashing damage and increase necromancer’s hammer’s critical threat range to 19–20. On the other hand, if the majority were fleshy (at least two), the increased mass causes necromancer’s hammer to deal bludgeoning damage and increases its critical hit damage to ×3.
Undead that have been destroyed by positive energy or a similar effect that does not leave a corpse, like a disintegrate spell, cannot be used to form a necromancer’s hammer.