Suggestions for bringing DRK up to par, and QoL changes.

[Aana]

I mean you can repeat it with a hypothetical version of IB that's decoupled from Defiance, and no Grit on the DRK.

In that case, the WAR is healed from 42760 to 48750, then takes 40000 damage after the IB reduction, winding up with 8750 HP.
The DRK's shield reduces the hit from 50000 to 38600, leaving the DRK with 4150 HP.

If the tankbuster is bumped up to 60000 damage, the WAR survives with 750 HP, and the DRK is dead.

You guys are just splitting hairs at this point.

Defiance+IB= 20% mitigation, 25% HP boost=156% effective HP
Grit+TBN= 20% mitigation, 20% HP= 150% effective HP.
ShieldOath+Shell= 20%+25% Mitigation=166% effective HP

IB has a heal attached, TBN can be cast on other people, shelltron is the strongest but has the 1 hit onry downside.

They are friggin equal. Of all the things to QQ about FFS. The differences between these things are drops in the ocean. You can concoct a specific number of HP and damage type that will kill any of those but leave the others alive. Whooptie doo. Its so plainly obvious SE designed these to serve the same function and they do their jobs.