Crafting Magic Items
Source: Ultimate Magic, p. 94
When a spellcaster is crafting a magic item, and fails the skill check to create the item, the GM can choose to give the caster a spellblight instead of having that check result in a cursed item. Determine the spellblight randomly based on the caster level of the item she was attempting to create. Creating an item with a caster level of 10 or lower gives a random minor spellblight, while creating an item of caster level 11 or higher gives a random major spellblight.