mania

Short definition from Wiktionary

Noun

1. 1
   Violent derangement of mind; madness; insanity.
2. 2
   Excessive or unreasonable desire; insane passion affecting one or many people; fanaticism.
3. 3
   The state of abnormally elevated or irritable mood, arousal, and/or energy levels.

Proper noun

1. 1
   The goddess of the dead and ghosts.