Once per casting attempt, after the casting dice are rolled but before a dispel attempt is made, the bearer of this magic item can sacrifice one model in her unit. Choose which model is sacrificed – it is immediately removed as a casualty with no saves of any kind allowed – then roll a D6. On a 4+ the Sorceress gains an extra power dice that must be rolled and added to the casting result; dispel attempts can now be made and the spell resolved. On a roll of 3 or less, the sacrifice has not generated enough power – you can either immediately sacrifice another model from the unit and roll again, following the procedure above, or accept the original casting result (if the bearer is the only model remaining in the unit, no further sacrifices can be attempted.