Persistent Spell

The Persistent Spell feat is IMO over-powered and thus it will not be appearing in my game - do not ask for it you will only be disappointed.

Persistent Spell [Metamagic]
Prerequisite - Extend Spell

Benefit: A persistent spell has a duration of 24 hours. The persistent spell must have a personal range or a fixed range. Spells of instantaneous duration cannot be affected by this feat, nor can spells whose effects are discharged. You need not concentrate on spells such as Detect Magic or Detect Thoughtsto be aware of the mere presence or absence of the things detected, but you must still concentrate to gain additional information as normal. Concentration on such a spell is astandard action that does not provoke an attack of opportunity. A persistent spell uses up a spell slot six levels higher than the spell’s actual level.

Alas no Clericzilla's allowed.
Great as none of us are playing Clerics it means the NPC's can't get it