DeGras's Pilfering Fingers

Glantri: Kingdom of Magic

The multiclassed wizard/thief Allistair DeGras came up with his pilfering fingers spell so his magic could better aid his other talents. Casting the spell lets a wizard add 5% per experience level to the chance of success of any one thieving skill, chosen at the time of casting. This bonus applies to all attempts to use the skill during the spell's duration. If the caster has no thieving skill bonuses (perhaps the caster is not a rogue), use a -10% as the character's base chance for any skill (with no Dexterity modifier).

One drawback to this spell: While it's in effect, the wizard can cast no new spells. (Other actions are possible.)

Wizard's Spell Compendium

Casting this spell lets the wizard add 5% per experience level to the chance of success of any one percentage-based thieving skill chosen at the time of casting. This bonus applies to all attempts to use the skill during the spell's duration. If the caster has no thief abilities, the caster gains one percentage-based skill for the duration of the spell. His score in the newly gained ability is 5% per level with a 10% penalty, and no racial, armor, or Dexterity bonuses apply. The thief skill cannot be raised above 99%. While the spell is in effect, the wizard can cast no spells, although other actions are possible. The caster can end the spell at will.