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Hat of Fire Acuity
Hat of Fire Acuity
Uncommon
Fire Acuity: Whenever you deal Fire damage, you gain Arcane Acuity for 2 turns.
It is said some wizard hats grant the power to keep your head cool - both literally and figuratively.
Location - Hat of Fire Acuity
Act 2 - Shadow-Cursed Lands
Located in the 
Last Light Inn. Can be looted from the Strange Ox.
Act 3 - Rivington
Located in a barn, can be looted from the Strange Ox.
Discussion
Last Light Inn X: -28 Y: 170: Can be looted from the Strange Ox in Dammon's blacksmith in Act Two.
Rivington X: 38 Y: -149: Can be looted from the Strange Ox, who is on a hill west of the requisitioned barn a the beginning of Act Three.
Arcane Acuity
Affected entity has a +1 bonus to its spell Attack rolls and spell save DC for each remaining turn.
Reduce the duration by 2 each time the entity takes damage.
Arcane Acuity has a maximum Duration: 10 turns.