Eternal Torment

Eternal Torment is a  passive skill, unlocked at level 40.

In-game
The Curses include all 3 Curse skills:
 * Frailty
 * Leech
 * Leech

The cost reduction is multiplicative to other Essence cost modifiers.

Duration of each curse on enemies increases to 5 minutes; it will end, however, if the Necromancer ventures too far (200 yards) or leaves the level / changes the zone.