Taking the Contingency idea a bit further, the evil high priest is thorough enough that he could cast Miracle every 20 days or so to give himself the benefit of a Contingency spell, as it lasts one day per level. Assuming he already has the Pact spells upon himself (Renewal, Stalwart & Death) for emergency healing, condition-relief and death, what other eventualities would you suggest an evil high priest of a deity of slavery & tyranny plan for?
1) Another Heal spell, just in case?
2) Wall of Stone if an Anti-Magic field is nearby?
3) A Greater Dispel Magic to use as a counter spell in case somebody tries to dispel his buffs?
4) A spell to transport him to a safe location?
5) Something else?