extra slotExtra Slot - Mods for Sonic the Hedgehog Forever. Sonic the Hedgehog Forever Mods Extra Slot. Overview. Admin. Ownership Requests. Permits . Withhold. Tickets. Report. Add Mod. ChaotixBenefit. You gain one extra spell slot in your daily allotment, at any level up to one lower than the hhest level of spell you can currently cast.