Discovery, Exploration
While arcane practices have been in evidence since the start of the Era of Tranquility (from those born with innate talents, and rare folks who were able to cobble together enough learning, or those who made pacts for power), they were little understood. However by 1200ET, some were growing frustrated with the deities' refusal (or perhaps inability) to solve all their issues, and some turned to the arcane instead. Magical organisations and learning institutions began to form, analysing the arcane, and pushing the limits of what could be done.