Spellscar

Abjuration
Level: Cleric */Oracle * 8, Sorcerer */Wizard * 8
Components: V, S, M (a pinch of sand from the Spellscar Desert)
Casting Time: 1 Standard Action
Range: medium (100 ft. + 10 ft./level)
Area: two 10-ft. cubes per level (S)
Duration: 10 minutes/level (D)
Saving Throw: -
Spell Resistance: -
  This potent spell invokes the same sort of magical devastation that created the Mana Wastes so long ago- albeit on a much more localized (and thankfully temporary) scale. Within the area you choose to affect with spellscar, the terrain takes on a strange pale hue, as if colors were muted. Periodically, ripples of vibrant color wriggle through the terrain. Within this area, any spell, spell-like ability, or magic item activation automatically triggers a primal magic event-a spellcaster can avoid triggering such an event by making a concentration check (DC 15 + twice the spell's level), but non-spellcasters who activate magic items have no such option.
  You gain a +4 Insight Bonus on concentration checks made to avoid triggering primal magic events while within a spellscar you have created, and if you do trigger a primal magic event, you may roll d% twice and pick which of the two results you wish to have occur.