Flow Lines

Mystia flows through out the Multiverse in a kind of vein called the Flow. It is the life blood of the Multiverse, and in Terr'ahna it flows throughout the world in concentrated lines known only to scholars as Flow Lines. Not many outside of scholars know of the Flow Lines. In areas where these lines cross, called Crossroads, Mystia can be especially concentrated and may erupt in Mystia Surges, causing all kinds of strange effects.
These lines are typically imperceptible by mundane means, so locating a Flow Line requires a magical connection of some kind (though not necessarily the ability to cast spells). Typically Flow Lines' sizes correlate with their potency, with higher-level Flow Lines being wider and easier to notice. But Flow lines are by nature enigmatic phenomena, and some particularly powerful ones are as thin as thread. In rare cases, Flow lines might have physical manifestations that make their presence more apparent. For example, a Flow line attuned to electrical energy might manifest as a constant stream of sparks and electricity arcing along the Flow line's path, or a Flow line suffused with positive energy might appear as a strip of overgrown and mutated plants.
A character can locate a Flow line with a successful Occultism check to Identify Magic, usually against a DC of 30 for a weak and minor ley line or 20 for a powerful one, but a particular line's presence might be more obvious if it has noticeable magical manifestations. A successful check reveals the location of a Flow line but not its capabilities. Each ley line has at least one trait tied to a tradition of magic. To determine the effects of a Flow line, a character must succeed at a check to Identify Magic based on its tradition, with a DC equal to the hard DC of the Flow line's level. Finding the exact position, strength, and effects of a Flow line can be extremely helpful for characters attempting to access the ley line's power.

Crossroads

Also known as Flow Line Nodes to some scholars, Crossroads are the point at which multiple Flow lines intersect. Incredibly rare and powerful, Crossroads provide those who tap into them access to all of the intersecting Flow lines' abilities, and they usually produce one or more additional effects based on the combination of intersecting Flow lines. A Crossroads' level is equal to that of the highest-level Flow line that intersects at the node. Enterprising PCs or NPCs sometimes seek out nodes as sites to perform rituals to establish Flow line nexuses. Such locations are jealously guarded by those who wish to claim the nexus's power.

Using Flow Lines

While locating a Flow line might be a difficult process, making use of a Flow line's power is remarkably simple. Accessing the power of a Flow line requires using the Tap Flow Line general skill action. The results of this action are based on the benefits and drawbacks of a Flow line.

Flow Line Rituals

Those who build a stronghold on a Flow line might use rituals to increase their advantage. The following rituals allow easier or more powerful benefits from Flow lines.
Empower Flow Line, Establish Nexus