Enlightenment

Effect
Increasing Enlightenment level doesn't affect the focus cost, but lowers the fizzle chance.

Sun Attunement affects the intelligence bonus and duration, and spell critical chance duration.

Stacking and charging glyphs improve the focus cost, intelligence bonus and duration, and spell critical chance bonus and duration.

Limits
Enlightenment will cancel Air's Embrace and Strength of Earth, and vice versa.

External Reference

 * Magic, Combat, and Crafting Skills on the Shroud of the Avatar Forums