Temporal Storm
Conjure a magical storm to slow the passage of time and thereby slow your enemies.
Level 1 Time can be stopped for 6 seconds.
Magic cost: 20
Level 2 Time can be stopped for 8seconds.
Magic cost: 21
Level 3 Time can be stopped for 10seconds.
Magic cost: 22
Level 4 Time can be stopped for 12seconds.
Magic cost: 23
Level 5 Time can be stopped for 14seconds.
Magic cost: 24
Never tried it myself.
Source is LocusInn for this.
that does sound very powerful indeed...