Hysteria

Hysteria is a Master level Illusion spell that requires a quest to obtain. You must first reach 100 in your illusion skill, and then talk to Drevis Neloren (The Dark Elf Mage who is in the College of Winterhold) to obtain the quest titled "Illusion Ritual Spell". Upon completion you will go back to him and he will give you Spell Tome:Hysteria. Hysteria is an Area of Effect illusion spell that requires two hands to cast, the animation for charging the spell takes around 8 seconds, and the spell itself only has effect on the radius of those around you. The spell is a stronger version of Fear, and in addition has the AoE to it.

Hysteria can be improved with.. You cannot buy Hysteria through mage merchants, it can only be obtained through the questline "Illusion Ritual Spell".
 * Master Illusion
 * Aspect of Terror 
 * Animage
 * Master of the Mind 
 * Kindered Mage