Greater Blighted Critical

Critical

Your critical hit from a spell or spell-like ability afflicts the target with a major spellblight.

Prerequisite: Blighted Critical, Critical Focus, caster level 12th.

Benefit: Whenever you confirm a critical hit with a touch spell, ranged touch spell, or spell-like ability against an opponent, the victim gains a random major spellblight (see page 96).

Special: You can only apply the effects of one critical feat to a given critical hit unless you possess Critical Mastery.

Source: Ultimate Magic