The kelippot are the shells that surround and conceal holiness, the realm of the other side. In Lurianic thought they formed from the shards of the broken vessels and hold captive the sparks of divine light. Redemption frees the sparks and leaves the husks without life.
Kelippot
Husks or shells: in Kabbalah, the forces of evil that encase and feed on fallen sparks of holiness.
Also: qliphoth, kelipot