Watoomb is an ancient and mystical entity.
Not known is much about Watoomb.
In the comics
Millennia before the modern era, Watoomb was a powerful mage that dealt with incredibly important mystic entities. Seven mystic entities and he quarreled about who, among them, was the most powerful one and they organized the Wager of the Octessence. Watoomb, as each one of the others, created a totem in which a fraction of his power was contained. The first human being who had touched the Totem would be transformed into a living incarnation of that power. The Totems were hidden in various parts of the world.
In the Modern Era, Watoomb was retiring from mystic affairs for a while and wanted to choose a disciple to whom he could pass his awesome Wand to. The choice should have fallen to the winner of the mystical fight between Doctor Strange and Cyrus Black, both apprentices. In another dimension, Watoomb gave one half of his specter, the Wand of Watoomb, to each one of the sorcerers. Strange won the fight and Watoomb retired to his own dimension.
- Doctor Strange (Mentioned only)