Affinity

Affinity is a buff granted by the Trinity skill. There are three types of Affinity: Fire, Cold and Lightning. You can have a maximum of 100 of each type of Affinity. You lose 10 Affinity per second of specific types if you haven't gained Affinity of that type in the past 8 seconds.

Skill gems

Trinity
Become attuned to all Elements building up Fire, Cold and Lightning Affinity based off the highest Elemental Damage type dealt by your Hits.Your Elemental Damage is enhanced the more Affinity of any type you have.3% more Elemental Damage per 30 Affinity of any typeOn dealing Elemental Damage with a Hit, gain 10 Affinity of the highest Elemental Damage type and lose 3 Affinity of the other types(0-15)% increased Skill Speed while total Affinity is over 250