Soul Tether build around

Soul Tether is arguably a bad Unique even for a belt.

3 Charm slots on it certainly does help out a bunch mind you.

A little ES, decent Int.
Lose ES recharg rate, furthermore lose 5% (3.9& krangle) ES per second. For what? Leech excess contributes to ES.

First issue, you always have 0 ES until you leech some.
Second issue, the more ES you have the faster it depreciates.
Third issue, if you have full life you don't trigger the leech effect.

First solution, Zealots Oath to balance (or exceed) the ES depreciation so you can hold onto your ES again.
Second solution, Atziri's Disdain & Ornate Plate to link ES and ES regen via ZO to life. This mitigates the depreciation of the ES by scaling both the amount and regen rate together with life. Issue 2.5, this ES leech build around is a life build...
Third Solution, anoint Fast Metabolism, the third most expensive anoint in the game to allow leech to trigger regardless of life.

And voila! my 2 exalt corrupted Unique is now allowing my ES to be a real extension of my Life through leech!
It only costs me a couple divines to anoint, why is Fast Metabolism so darn expensive?

But together with Sanguimancy, Gasping Wounds (Progenesis) and 50% Damage as Life Recoup (and Pliable Flesh), along with Temp Chains Blasphemy and a 45% block shield I am near unkillable! except for the new rare mod for max 50% recoup, that scares the heck out of me. But also Fast Metabolism literally states

And that's the Blood Thirsty part of my Blood Thirsty Bone Grinder build.