Harmony is a trait added in Update 18 which can only be found on jewelry. Jewelry with this trait does not drop normally, but may be obtained by completing Undaunted Pledges, or by acquiring them from another player. Once learned, items with this trait may be crafted using ON-icon-trait material-Dibellium.png Dibellium, which may be found in daily Dungeon Finder rewards. Items with the Harmony trait will increase the effectiveness of Synergies you activate by an amount dependent on the quality of the item. Note that most but not all Synergies are affected. In particular, Synergies which cause damage, provide healing, restore resources, or give Damage Shields are improved, but others are not.[verification needed — Need a list of which synergies are not affected]

Increase Synergy Effectiveness
Normal Fine Superior Epic Legendary
12% 14% 16% 18% 20%