Hex Vulnerability

Necromancy [curse]
Level: Shaman * 1, Warlock * 1
Components: V, S, M (a drop of your blood)
Casting Time: 1 Standard Action
Range: close (25 ft. + 5 ft./2 levels)
Target: one creature
Duration: 1 round/level
Saving Throw: Will negates
Spell Resistance: yes
  The targeted creature becomes susceptible to a repeat use of your harmful hexes, even if you could not otherwise target that creature with a particular hex for a certain time period. For example, normally after you target a creature with a Charm hex, you cannot target it again for 1 day. But after casting this spell on a creature, you could try the Charm hex repeatedly as long as the spell persists. The end of this spell has no effect on any active or ongoing hex on a creature. Fox example, if the creature failed its save against a second use of your Charm hex, it remains charmed for the normal duration, even if the spell expires before the hex does. Each subsequent casting of this spell on a target within a 24-hour period gives the target a +4 bonus on its save against the spell and imposes a -4 penalty on your Caster Level check to overcome the target's spell resistance with this spell.