Dark Knight : Just another mitigation tank

[Altena]

You pop a shield - reduce/absorbs 2k damage
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"Pop a shield" ? When did I say that?

I am saying something akin to a mechanic that forces the job to push their lifesteal beyond their HP container which generates a shield.
Look at something like Wildfire, but think of it as a self-buff. You pop it, then in order to get the max potential out of that buff, you need to do a certain amount of damage or lifesteal a certain amount of HP. This generates an adlo-style shield (or if you wish to make it more simple, increases your HP container during the buff duration that only lifesteal can heal).

A blood tank, yes - but does that mean it has to not have a single mitigation CD? What I am asking for is flavour, and not binary mitigation that requires no thought process over and above pressing a button.

Want another mitigation tank? Fine. Just give that mitigation a mechanic that is far more interesting than pushing a CD moments before a tank buster.