Aura moderate (no school); CL 11th
This special ring comes in four varieties, all of them useful only to arcane spellcasters. The wearer’s arcane spells per day are doubled for one specific spell level. A ring of wizardry I doubles 1st-level spells, a ring of wizardry II doubles 2nd-level spells, a ring of wizardry III doubles 3rd-level spells, and a ring of wizardry IV doubles 4th-level spells. Bonus spells from high ability scores or school specialization are not doubled.