Dungeon Keeper Wiki
It has been suggested that this page be renamed to Fear (spell).
Reason: There's no Keeper spell of this name, so there's no need for such a specific disambiguation.
The talk page may have more information.

Fear is a creature spell which was cut from Dungeon Keeper. It is likely to have been a projectile spell which causes the enemy to flee the area temporarily, similarly to how creatures act when hit by the Cave-In spell. It is unknown why this spell may have been cut, but it may be due to balancing issues or problems with implementation. Given that there's no icon, the spell was presumably cut well before the game's release.