...I can't believe I have to say this, genuinely cannot.

Oblation is a multi purpose low CD tool to flexibly add an additional layer of 10% mitigation, on either yourself or an ally, regardless of role and independent of TBN. Mind you in higher level content (Savage+) we even use Reprisal for buster mitigation, which is also 10% and it hella matters.

Dark Mind is a single purpose self mitigation tool with a critical flaw that comes to light when there is no source of magical damage outside of raidwide attacks. It is the "unique CD" of DRK and is the type equivalent to Bulwark, Thrill of Battle and Camouflage (unique cooldowns wiith niches).

Oblation's role is not solely making up for Dark Mind having this critical weakness vs all of these cooldowns. It should NOT be merged with or folded into Dark Mind; Dark Mind needs to be adjusted in solitude without touching what makes DRK's Oblation so flexible to hand out.

If you think Oblation is weak, be my guest and suggest buffs for it but I assure you every version of "just merge it with..." is objectively worse and reduces diversity.