The Zûlenthir; which mean "Shadow-Stones," in elvish, were seven powerful magical orbs created in 220/5 by the Sorimmar the Necromancer.

Sorimmar created these artifacts, which were also called "Soul-Gems," to entrap the Zûl and bend them to his will.

The seven onyx stones were set into ornate swords and given by Sorimmar to the seven kings of the Eastern lands.

Once these kings took possession of the weapons, their life force was eventually channeled into the stones and they became undead creatures, totally under the domination of their master Sorimmar.