What is an Astral Node?
Astral nodes react to the light level
The Thaumcraft 5 wiki states:
- Astral Node - the Astral Node is a rare Node type that replenishes the respective Aura it is attuned to depending on the amount of light it is exposed to, with higher levels of light correlating with faster output of aspects into the Aura.
While the above was written for TC5, reddit user /u/Xirema notes:
Those were in the previous versions. They work exactly as expected: the greater the light level near the node, the more aura they put out.