Epic Spell, Summoning Sanctuary

Grimoire of Cosmic Entities Volume One By Eli Atkinson, William Church and Serge W. Desir, Jr.
Original Concept by Serge W. Desir, Jr.

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Summoning Sanctuary
Abjuration
Spellcraft DC: 80
Components: Components
Casting Time: 1 minute
Range: Touch
Effect: 30-ft. spherical emanation
Duration: 24 hours
Saving Throw: None
Spell Resistance: Yes

To Develop: 720,000 gp; 15 days; 28,800 XP. Seed: ward (DC 14). Factors: increase area of effect by 200% (+8), increase bonus on caster level check to overcome Spell Resistance by +20 (+40), determine creature type to be warded against at the time of casting this spell (ad hoc +4), prevent spiritual wounds within summoning area (ad hoc +14).

This spell creates an area in preparation for summoning a powerful creature. Proof only against physical attacks, it prevents the next summoned creature, and all other creatures of that type summoned into the area for the duration of the sanctuary, from leaving a 30-foot spherical emanation area by any means. The summoned creature may be able to break past the barrier by means of its Spell Resistance, in which case the caster makes a caster level check with a +20 bonus.

Additionally, the typical effects of summoning a powerful cosmic entity to the Prime are ignored if the creature is summoned within a summoning sanctuary. Thus summoning or calling a Duke of Hell to the Prime in conjunction with this spell has no ill effects