Equip: Improves your resilience rating by 84. Equip: Your spell casts have a chance to increase your spell power by 590 for 10 sec.
Flow of Knowledge is an end game caster trinket that was added with patch 3.0.8. Originally it appeared on the PTR servers as improving critical hit rating by 84, but was changed on release. It is primarily used for PVP due to its passive effects and resilience, however because of the high proc rate (10% chance) it can be combined with another similar trinket, such as the [Sundial of the Exiled], for powerful effects.