Tank Fixes

[Derio]

IMO all tanks should have their 2 part AOE combo before lvl 50.
AD on DRK should have a 30s cooldown.
LD on DRK should have a 50% heal requirement or increase healing received by 300% to help no WHM healers and future healers added.
Dark Mind should be 15% magic mitigation and 10% physical mitigation.

[Shurrikhan]

Dark Mind should be 15% magic mitigation and 10% physical mitigation.

You could honestly even up the anti-magic component up to 20% as long as you're willing to extend its cooldown to 90 seconds as to be the opposite of Camouflage (10% vs. magical and an RNG-driven average of 20% vs. physical)...

Though, given DRK's outperforming GNB average mitigation over time in all other ways, I'm not sure DRK even needs that. Living Dead and TBN future-proofing are the only real issues to me at this point.