Amplify Damage is one of the most potent curses the Necromancer has available to him. It lowers the Physical Resist of the enemy monsters by 100%. It is possible to remove Physical Immunities from monsters, and it is essential for Necromancers focusing on the Summoning Skills.
Amplify Damage is a great skill to use in parties, as almost all melee characters benefit from it. It is however not adviseable to spend more than one or a few points into this skill, as the potency of the skill doesn't increase. The benefit of added radius and duration can be achieved with items providing + to skills, something most Necromancer builds tend to focus on.
This deceptively potent curse rapidly advances the age and putridity of any wound. Ordinary blows will cut through flesh and carve particularly vicious wounds that fester and seethe. Increases the amount of damage received.
↑Diablo II Manual, page 71. Blizzard Entertainment, 2000.