The following is a list of Illusion spells available in Skyrim. The more basic ones can be bought from court wizards, but the most powerful spells must be obtained from the College of Winterhold. Each multiple of 25 skill points reached will unlock a new set of spells.
Illusion is used to alter others' perception of the world to benefit the caster.
Novice (0)
Clairvoyance
Courage
Fury (Altmer start with this spell)
Apprentice (25)
Calm
Fear
Muffle
Adept (50)
Frenzy
Rally
Expert (75)
Invisibility
Pacify
Rout
Master (100)
Call to Arms
Harmony
Hysteria
Mayhem