Combine

Using this spell, three to five priests combine their abilities so that one of them casts spells and turns undead at an enhanced level. The highest level priest (or one of them, if two or more are tied for highest) stands alone, while the others join hands in a surrounding circle. The central priest casts the combine spell. He temporarily gains one level for each priest in the circle, up to a maximum gain of four levels. The level increase affects turning undead and spell details that vary with the caster's level. Note that the central priest gains no additional spells and that the group is limited to his currently memorized spells.
The encircling priests must concentrate on maintaining the combine effect. They lose all Armor Class bonuses for shield and Dexterity. If any of them has his concentration broken, the combine spell ends immediately. If the combine spell is broken while the central priest is in the act of casting a spell, that spell is ruined just as if the caster was disturbed. Spells cast in combination have the full enhanced effect, even if the combine is broken before the duration of the enhanced spell ends. Note that the combination is not broken if only the central caster is disturbed.

Sphere: All
(Evocation)
Level: 1

Range: Touch
Components: V, S
Duration: Special
Casting Time: 1 round
Area of Effect: The circle of priests
Saving Throw: None