The weaves of life are a phenomenon affected by the willpower of martial artists among the Wild Geese, Heraan, Nil'kemorya and Vell-os to influence combat in their favor. To the uninitiated, this looks like exploiting mechanical advantages or luck. Training is required to visualize the weaves, but any human can do it. However the Ory'hara learns this faster and in a subtly different way where it sees this as a dance rather than a weave.
"In learning Heron style, you are taught to read and direct the "Weave" of combat. Subconsciously, all of us fight to a pattern and rhythm. Heron Style teaches us to detect it and control it. It isn't so much that you defeat your opponent, but he defeats himself, if you force the "weave" to do so. It is hard to explain, but once felt, and mastered, it makes all combat easier, from one on one, to mammoth battles between hundreds of ships. There is one teacher Karlaekaar, to whom the most promising students are sent. It is said he imprints the ability to read and control the "weave" on the student subconsciously. This makes their "weave" unreadable, and therefore very dangerous." ― Eamon Flannigan
The Vell-os also refer to their telepathic abilities as utilizing weaves in their construction, though their abilities far surpass anything that a normal human can do.