Nitor (Thaumcraft 4)

Nitor is magical source of light added by Thaumcraft 4 and is created in the Crucible. It can be placed on any block and will provide light as bright as a torch. After the block is destroyed Nitor will continue to float in mid-air providing light. In contrast to ordinary torches Nitor is not destroyed by water and can be placed to provided underwater source of light, and will block flowing water. When placed under the crucible, Nitor will provide it with enough heat to cause the water to boil.

Thaumonomicon Entry
This flame seems to be fueled by magic itself. The number of uses for an everburning flame seems endless, but unfortunately it doesn't seem to produce much more light than heat, though it could prove to be a steady source of light and energy.

Nitor can also be placed in the world to act as a magical light source.

Recipe
Aspects: 3 x Ignis, 3 x Lux, 3 x Potentia

Catalyst: Glowstone Dust