Tenacity

[ReiMakoto]

Uh... you are a bit wrong here. The diminishing returns you are describing here are only relative to the damage healers and dps would take. When comparing the damage taken between tanks, the 20% damage reduction from Tank Mastery is meaningless. A tankbuster that deals 150k damage without any additional mitigation from buffs or Tenacity is a 150k tankbuster on all 4 tanks.

The mitigation from Tenacity is always applied; so the mitigation that experiences diminishing returns is actually that from the cooldowns. The max Tenacity in 5.2 is 3845 at i500 which gives a .8975 damage taken multiplier.

Im not a bit wrong here, the 20% from the trait is still present in the damage formula and is interacting with tenacity always http://allaganstudies.akhmorning.com/guide/damage/, so it will suffer the same diminishing retuns as any other mitigation buff as they are all multiplied together.

Think of it like this in Stormblood as a simplified example (i.e. not taking into account all the other variables which would make ten even smaller)

Scenario A): Tank in no tank stance with 5% tencacity mitigation takes a hit that would do 50k

50000*0.95= 47500

Scenario B): The same tank in tank stance

50000*0.8*0.95 = 38000, or this to say because of diminishing returns tencacity only provided 4% not its "raw" 5%.

We now exist in a perpetual scenario B as of ShB where the tank stance defence buff is always active, so is always interacting with any buffs you use, tenacity or otherwise