The Convention of Elements (also known as Convention of the Elements) is a Legendary ring in Diablo III, added in patch 2.2. It requires Character Level 59 to drop. The unique affix increases damage done by skills of specific elemental damage type by 150-200% for 4 seconds. The increase in damage is applied as an independent multiplier and not additively: it multiplies all damage done by skills of respective element, not adds 150-200% to the respective elemental skill damage bonus. Damage is amplified exactly during the active phase for that damage type: all sources of damage, including previously applied damage over time, will be affected (and applying it during the active phase will only boost it during this and next active phases for the respective element).