Dunamancy

Dunamancy is the ancient and esoteric study of the magic called dunamis which is based on potentiality and probability. Dunamis was discovered independently by the Kaldorei and explored to manage and control time, gravity, and fate, removing chance from mortal actions.
Dunamis is "the primal magical energy of potentiality and actuality, an anticipatory arcane force that helps shape the multiverse and might very well be what holds its elements together, like an infinite web of unseen tethers. Those who study to control and tap into Dunamancy can subtly bend the flow of time and space by controlling the forces of localized gravity, peering into possible timelines to shift fate in their favor, and scattering the potential energy of their enemies to rob them of their potency."
The Kaldorei discovered Dunamancy very early on in the history of northrend, and worked on it for tens of thousands of years. The early access to advanced works of existing schools of magic, plus the volatile mana, ley lines, and the Moonshards, let the Kaldorei prosper, and decuple their knowledge exponentially.
Unfortunately, even though it was studied for tens of thousands of years, Dunamancy was extremely complicated, and was still very experiemental, even at the fall of Dalaran. Immense power and knowledge of all other schools of magic is required before taking on the study.