Hello,

Sorry for my bad english right away.

Today I did some math on the two meta gems available for Tanks.

+81 Stamina +2% Armor

+81 Stamina +5% Block

Since 5% Block is bugged it's only 1% .

The Armor values are just pre-made numbers to make the math a little more handy, but they are quite close to mine in a Raid. The other Stats are exact ones.

So we start with +2% Armor!

We assume:

40000 Armor with armor Gem: ~55,117% -> 44.883% incoming Dmg left

39215 Armor with block Gem: ~54,626% -> 45.374% incoming Dmg left

44.883 / 45.374 = 0.9891

Taking these numbers is a DMG reduction of ~1.08%

12,05% Dodge (pre DR) = ~10,57% Dodge post DR

15,30% Parry (pre DR) = ~12,86% Parry post DR

5,00% Miss

=28,42% Avoidance

Since Bosslvl is 88, you need 102.4% Avoidance to be unhittable.

So a Boss hits to 73.97% with his melee swings.

1.08%*0.7397 = 0.7988% effective DMG reduction from Austere Shadowspirit Diamond.

Now the Eternal Spiritshadow Diamond

30% Block value

52.01% Block Chance +8.33% (Shield Block 33% Uptime)

Based on data on World of Logs I have a Crit. Block Chance of ~37%

30*0.63+60*0.37 = 41.1% Block value average

By inserting the Block Meta Gem I'd gain 1% Block value and 2% critical Block value.

31*0.63+62*0.37 = 42.47% Block value

An increase of 1,37% Block value which in my case happens 60.34% of all swings.

Shield Block used on CD:

1.37*0.6034 = 0,8266% effective DMG reduction from Eternal Spiritshadow Diamond

Conclusion:

Eternal Shadowspirit Diamond provides 0.0278% more Mitigation if Shield Block is used on CD (in my case)

I'm assuming the Block Meta scales better with gear than the armor gem does, but i didn't do the math

If you find some mistakes feel free to reply

Greets