This spell is an effective method for keeping adversaries from reaching a Necromancer, while allowing him to attack from range or make his escape. This can be of great advantage to a Necromancer, especially a Bonemancer who often has no summons to hold his enemies away, and lacks the more destructive power of a Sorceress. With this skill, enemies can be held at a distance while the Necromancer takes them out at a safe distance.
While the Wall hp might appear low, it scales in Nightmare and Hell to better stand against the increased damage the monsters deal.
This spell enables the Necromancer to call upon the remnants of the spirits of all the creatures who have ever died in the area. It accumulates their fossilized remains and summons forth from the ground a barrier of dense, fossilized bone.
↑Diablo II Manual, page 74. Blizzard Entertainment, 2000.