Fallen Lunatic

From Diablo Wiki

Lunatics are enraged, oversized fallen creatures that are bloated seemingly to the point of bursting, an impression buttressed by the fact that these insane demons rush their intended victims and then stab themselves until they explode. A more fitting name could not be found for these maniacal beings.

Fallen
Fallen Imp • Fallen Shaman • Fallen Lunatic • Fallen Overseer • Fallen Hound