Orbs

General Description
Orbs are an additional way to increase hero power, secondary to gear. Unlike gear, they come in only Uncommon, Rare, Epic, and Legendary rarities. There are 3 types of orbs: Health Orbs, Attack Orbs, and Defense Orbs. One of each type can be docked on every piece of gear that is equipped. They are upgraded with gold only. They do not have bonus links themselves, but they activate a piece of gear's bonus link (except from main hand and off hand)  if the orb is attached to that specific gear.

Orb lvling cost google sheet