Sadomasochism

Necromancy [pain]
Level: Antipaladin* 3, Artificer * 3, Cleric */Oracle * 3, Inquisitor * 3, Magus * 4, Sorcerer */Wizard * 4, Warlock * 4
Components: V, S
Casting Time: 1 Standard Action
Range: personal
Target: you
Duration: 1 minute/level (D)
Saving Throw: Will negates, see text
Spell Resistance: yes
  While subject to this spell, anytime you are dealt damage, your attacker must roll damage for the attack twice and take the higher result, but the attacker must also succeed at a Will saving throw or be demoralized (Pathfinder RPG Core Rulebook 99) for 1 round. Each time you deal damage to a creature demoralized by this spell, you roll damage twice and take the higher result. This spell originally appeared in Pathfinder Campaign Setting: Inner Sea Gods.