Dimensions, rituals and spiritual realms are sources for magic power as seen in Ras Al Ghul's Lazarus Pit, Doctor Occult's use of the astral plane and the transformations of Captain Marvel.
During the ceremony intended to invest Temple with leadership, however, King Snake rebelled, declared himself the next Naja-Naja, and his followers healed his eyes in a Lazarus Pit the cult has access to (which could only be opened by Temple, explaining Sir Edmund's subterfuge).
In return, Nyssa helps him restore his wife using the Lazarus Pit.
Lazarus | Lazarus of Bethany | Order of Saints Maurice and Lazarus | Open-pit mining | Order of Saint Lazarus | The Pit | pit stop | The Snake Pit | The Money Pit | pit viper | The Pit and the Pendulum | Pit River | Pit bull | Passion Pit | Lazarus Pit | Lazarus Long | Lazarus Fuchs | Emma Lazarus | The Pit and the Pendulum (1961 film) | The Lazarus Man | The Devil's Pit | Sylvain Lazarus | Richard Lazarus | Quatermass and the Pit | Pit viper | Michaelston-le-Pit | Mark Lazarus | Lazarus Geiger | Lazarus (department store) | Gravel Pit |