Fervor is a suffix that can appear on Jewels. It provides a small increase to Attack Speed.
It doesn't start spawning on items until Item Level 39.
Stats[]
Fervor
15% Increased Attack Speed
Can appear on: Magic Items
Is available on: Jewels
Magic Suffixes - Speed
Items
Increased Attack Speed — Readiness • Alacrity • Swiftness • Quickness
Faster Cast Rate — Apprentice • Magus
Faster Hit Recovery — Balance • Equilibrium • Stability
Faster Run/Walk — Pacing • Haste • Speed • Transportation • Acceleration
Jewels
Increased Attack Speed — Fervor
Faster Hit Recovery — Truth
Charms
Faster Hit Recovery — Balance
Faster Run/Walk — Inertia