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At first, it was called a clone, but now it holds a special place in your hearts.
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Triobanie
A lich (English: lich or lych, or German: leiche — “corpse”; [ˈlɪtʃ]) is, in modern fantasy, a mage-necromancer who has become undead, according to some versions — after death, according to others — instead of death. There is also a concept called the “ritual of eternal night,” during which a necromancer sacrifices a human (or several), seals his soul in a phylactery, after which he dies and is reborn as a full-fledged lich.
A lich is very difficult to destroy because, after its physical form is destroyed, it can be reborn with the help of a phylactery. An example of a phylactery is Koschei the Deathless’s chest, in which an object is sealed; destroying it is the only way to put him to rest. Koschei the Deathless himself is a prime mythological prototype of a lich.
I think I might go take some pictures of a heron.