SPELL-SECURE-HAVEN

Near the peak of their proficiency, a cleric can learn to maintain their protective sanctuary with very little concentration. It can become such that even if the sanctuary is dispelled or expires, the cleric can renew it with but a fragment of a thought. Such is the nature of the Secure Haven spell. With Secure Haven in use, the cleric need not worry that he will be without Sanctuary. However, the Secure Haven will use up mana from the cleric for its duration, and once protected by it, the cleric can not dispel it. It will not expire until either its duration has run its course or until the cleric runs out of mana to maintain it.

Duration is (3*30+PEL(50)/2).