Oblivion:Demoralize

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	Demoralize
School		Illusion
Type		Offensive (Non-hostile)
Effect ID		DEMO
Base Cost		0.49
Barter Factor		0
Availability (Click on any item for details)
Spells Scrolls Sigil Stones Staves

Demoralize up to level L for D seconds

Decrease target's Confidence (willingness to fight). Undead are not affected by this spell. (Use Turn Undead on them instead.) Afflicted targets will disengage combat and attempt to run away in fear.

For calculating magicka costs of this spell, the level needs to be converted into a magnitude, see Magnitude to Level Conversion. One implication is that the enemy levels affected by any Demoralize spell will be less than the quoted values if your Spell Effectiveness is less than 100%.

[edit] Notes

Demoralize is among the most powerful disabling effects in the game. An enemy who is running is an enemy who isn't fighting you. With a good spell, you can send entire armies running for the hills. Makes for excellent bow practice.
If you get in your target's way while he's running, he may still take a swing or two at you. Continual attacks may still bring the enemy back to retaliate.
Fleeing enemies can bring in all sorts of trouble. Use caution when Demoralizing fast runners or for extended periods of time.
At one point in development, it appears that two separate Demoralize effects were planned, one for creatures and and one for humanoids (much like it was in Morrowind, and similar to Command Creature and Command Humanoid). Although this was changed before release, there are some redundancies left by it, for example with Arrows.
If an enemy strikes you with a Demoralize effect, your active effects will say that you are demoralized but it will not actually affect you since you are not an NPC.
At high levels, especially if you are wearing armor (reducing your Spell Effectiveness), demoralize spells may not affect some creatures. An alternative is to Summon a fairly weak but fast running creature, then cast demoralize on your summoned creature. If the enemy has its attention on the summoned creature, the enemy will chase it and therefore run away from you.