Hesitation

Creatures affected by this spell hesitate before executing their intended actions. This causes them to modify their initiative rolls by +4. The initiative modifier occurs in the round following the round in which hesitation is cast.
The spell affects 2-8 Hit Dice or levels of creatures, although only one creature of 4 or more Hit Dice can be affected regardless of the number rolled. All possible victims are allowed saving throws vs. spells; those failing their saving throws modify their initiative rolls by +4 for a number of rounds equal to the caster's level.

[Tome of Magic]

Sphere: Time
(Enchantment/Charm)
Level: 2

Range: 30 yards
Components: V, S, M
Duration: 1 round/ level
Casting Time: 2
Area of Effect: 20-foot-radius circle
Saving Throw: Negates

Material Components:
a fragment of a turtie's shell