Sanctify

This cooperative spell allows the priests to create a beneficial atmosphere within a specified area. Companions of similar alignment to the casters will feel fortified and encouraged while in the sanctified area. The spell can be cast by a single priest or a group of priests.
After casting sanctify, the affected area is imbued with the deity's majesty. For followers of that deity, the area radiates a holy aura. These followers gain a +2 bonus to saving throws against all fear- and charm-based powers (a +2 to morale for BATTLESYSTEM rules units). Persons of the same alignment as the caster but of different faiths gain a +1 to saving throws ( +1 in BATTLESYSTEM rules). The effect applies only as long as the characters remain in the sanctified area.
Creatures intent on harming the priest or his followers suffer a -1 on saving throws vs. fear and charm ( -1 to morale for BATTLESYSTEM rules units) when on sanctified ground.
Undead creatures within the area are easier to turn; any priest standing on sanctified ground turns undead as if he were one level higher.
Although this spell can be cast by a single priest, it is most effective when cast by several priests at once. The duration of the spell is equal to one round per level of the caster. When several priests cast the spell, the level of the most powerful priest is used, with two rounds added for every contributing priest. Thus, one 8th-level and three 6th-level priests would give the spell a duration of 14 rounds (8 +2+2+2).
Sanctify is often used in conjunction with focus to protect the grounds of a temple or encourage men defending a castle.

Reverse: Defile

The reverse of this spell, defile, functions in an identical manner with respect to saving throws for charm and fear. However, priests standing on defiled ground who attempt to turn undead do so at one level lower than their current level.

[Tome of Magic]

Reversible

Sphere: All
(Conjuration/Summoning)
Level: 2
Cooperative

Range: 10 yards
Components: V, S, M
Duration: Special
Casting Time: 1 turn
Area of Effect: 10 yard x 10 yard square/priest
Saving Throw: None

Material Components:
the priest's holy symbol(s) and a handful of dirt from the grounds of an existing temple of the same faith
Reverse: the priest's holy symbol(s) and a handful of earth from a grave