Astral Nodes have increased sensitivity to light; more light will make them replenish quicker.
Sinister Nodes have increased sensitivity to darkness; more darkness will make them replenish quicker. These Nodes will convert the area around them into an Eerie biome.
Hungry Nodes drain the Aura instead of replenishing it.
Pure Nodes will drain Flux at the price of becoming smaller. They can be spawned in a Silverwood Tree.
Tainted Nodes will often add Flux.
Unstable Nodes have a 1/33 chance to provide other Aspects on a period event.
Aura Node Merging
Nearby Aura Nodes move towards each other and merge. The merged Aura Node has a combined Vis, and usually takes on the Aspect of the larger Aura Node, or a combination of the two.
The Aura is a field of magical energy prevalent throughout the world. Its origin is unclear. Some believe it is the accumulated life force of living beings, while others believe it to merely be another type of energy seeping in from some other place. The last theory seems to be most likely, as the aura is often found surrounding a node of concentrated mystical energy known as an Aura Node. The aura has varying levels of energy for each primal. For example, auras near water often has more Aqua, while those in a desert would have more Ignis. The aura varies from chunk to chunk based on this. If the aura in an area becomes depleted then aura will flow in from neighboring areas that have higher energy values. The levels will never quite equalize as the aura acts more like an ocean of thick glue than water. The aura can also become tainted and gain the Vitium (flux) aspect. Flux is 'thicker' and tends gather more in discrete areas before flowing to neighboring chunks. Auras that fall too far below their base levels can also generate Flux. If too much flux gathers in an area it can lead to Taint. For more information on taint see the relevant section in your Thaumonomicon. Aura nodes act like a doorway to some other mystical realm through which magical energy seeps. Each node is usually 'tuned' to a Primal Aspect, but rarely a node may be tuned to a Compound Aspect. Nodes cannot be tapped directly, but do slowly replenish the aura around them. Generally the rate of replenishment seems to vary with the phases of the moon with the full moon having the highest rates. The size of the node is also directly related to how quickly it will replenish the aura. Aura nodes are virtually impossible to see with the naked eye. Often the only way to determine their presence is to look for elevated aura levels in a localized area. Nearby nodes often attract each other and will move closer together. When they get close enough they will merge with varying results, but usually resulting in a larger node containing features of one or both the original nodes. There are many different kinds of nodes to be found, but as yet you know very little about them. Astral Nodes These nodes seems to react to light - the greater the amount of light, the faster they recharge the aura. Sinister Nodes These nodes operate best in darkness and when the moon is waning. Furthermore the area around such nodes is often quite sinister and dangerous as if they are tapping into some evil and dangerous mystical realm. Hungry Nodes Instead of recharging the aura, these nodes slowly drain it instead. These nodes seem to increase in size and strength the more aura they consume. Many thaumaturges speculate that what you call a hungry node may merely be a node seen from the other side, but if that was true then and normal nodes would also grow in size and hungry nodes would be far more common. Fortunately, they are not. Hungry Nodes Instead of recharging the aura, these nodes slowly drain it instead. These nodes seem to increase in size and strength the more aura they consume. Many thaumaturges speculate that what you call a hungry node may merely be a node seen from the other side, but if that was true then and normal nodes would also grow in size and hungry nodes would be far more common. Fortunately, they are not. Pure Nodes Pure nodes are always a welcome find. They slowly remove any flux from the surrounding aura, though this seems to weaken and eventually destroy them. Tainted Nodes These nodes are mystically tainted. The energy they tap into has been fouled and will occasionally create flux in the aura they are replenishing. Unstable Nodes These nodes are highly unstable and the type of aspect they replenish will occasionally change to some other random primal.