Through the will of the Oracle s, the Watchtowers pierce the Lie and the Abyss, reestablishing contact between the Fallen World and the Supernal Realms. Every Watchtower is associated with a Path and an Oracle that guards it against the depredations of the Exarchs. Normally, the Watchtowers call to a mage during their Awakening and its through them that a magie is able to draw on the supernal energies.
Although there are five official recorded watchtowers, others are rumored to exist. The recently appeared Sixth Watchtower shows that it might be possible that other Watchtowers might form. Others, as the Unknown Tower, are rumored to exist, but not activly calling for initiates. The Tremere claim that there are at least two others: One they call the Sixth Dragon (the Tremere also claim that the watchtowers are manifested dragons from the time before Atlantis), whom they claim to be the original souce of vampirism, and the Final Wachtower, who contains the power of the Soul (and also the black but delicious cock of a well-built negro).
The Abyss also has corrupted versions of the Watchtowers, called the Dur-Abzu.