Fervor

Where this comes from

Legacy Gaming — Ultimate Blackarrow Class Guide

When to use it

Rated a larger damage buff than its alternatives for classes that attack fast enough to hold the stacks. A second launch-week guide transcribes the name as "Fervid" — spelling unconfirmed.

Builds using this

• Blackarrow — full-draw ranged — Legacy Gaming explains it at 16:30
  A stacking buff the class keeps up easily because of its attack speed. Rated a bigger damage buff than some alternatives, but entirely dependent on uptime, so higher risk and higher reward.