Necromancy

Necromancy is a game mechanic that allows players to absorb souls from slain monsters and summon them.

Killing a mob with a Necromancy item equipped grants a chance of dropping its soul, which can then be summoned to deal and take damage for the player.

Items
Certain items have the ability, which is necessary in order to obtain and summon souls. To activate the ability with the, the item must be present in the player's inventory. With the other items, the player must use them to kill the mob they intend to capture its soul with.

Maximum Souls
Certain armor pieces can be used to extend the maximum amount of souls the player can store and summon.

Thus, the maximum amount of souls possible is considering the player is using a Reaper Scythe and wearing a Reaper Mask along with a Necromancer Lord Chestplate Leggings and Boots equipped.

Attempting to use an item that has more souls than the player can deploy at once results in summoning only the first few souls that were stored in the item. For example, if a Reaper Scythe has five souls, and the player does not have any armor pieces that boost the Scythe's capacity, then only the first three souls will be summoned.

Soul Drop Chance
The drop chance of a soul is determined by the level of the mob it drops from, with this formula: $$DropChance=\frac{100-MobLevel}{100}$$ However, the drop chance cannot go below. For example, a Mob would have a  chance to drop its soul, a  Mob would have a  chance, and a  Mob would have a  chance.

Mana Cost
The following formula is the required to summon the player's captured mobs:

$$\frac{\text{damage}}{50} + \frac{\text{health}}{100,000}$$

This can be reduced in several ways.

Trivia

 * The highest damaging mobs currently are the  for ranged combat and the   for melee. Alternatively,  Tank Zombie souls are quite cheap and considerably strong and are generally used against Voidgloom Seraphim.
 * The  souls were only obtainable during the Dante boss fight for around  minute, making them one of the rarest summons.
 * Rare souls, such as mini bosses, have a darker shade of purple and a glowing skull when the player obtains their soul on the ground.
 * Mobs summoned with necromancy items will despawn after if the summoning player is AFK, and cannot be re-summoned until the player moves.
 * Due to 's perk, whenever they are elected, all summon mobs'  are also doubled.