Meat, I can't see anything in that quote from Tommi's page that suggests DtM works on the raw damage. It says in 4.2 "Special Effects" that DtM is calculated on the total Physical Damage Taken, which is the modified amount, which is after all effects including Energy Shield (and PDR, etc).
It does say that you get the mana back from DtM before you get mana removed to pay for Energy Shield. But the amount that was to be removed was worked out way back at the start of the process, on the raw damage.
Anyway, with 20 points in TK, each point of absorbed damage costs 0.75 mana. With your 74% absorb, you are taking 0.74 * 0.75 = 0.555 mana drain per raw damage point.
Assuming no PDR, with 74% absorb each point of raw damage does 0.26 damage points. So you would need 0.555/0.26 = 214% DtM to see no mana drain at all.
ES + DtM is not exactly designed to be a complete lock. The better your absorb from ES gets, the harder it is for DtM to keep up with it.
[edit] When doing maths in public, you shouldn't try to do it too fast :doh:
It does say that you get the mana back from DtM before you get mana removed to pay for Energy Shield. But the amount that was to be removed was worked out way back at the start of the process, on the raw damage.
Anyway, with 20 points in TK, each point of absorbed damage costs 0.75 mana. With your 74% absorb, you are taking 0.74 * 0.75 = 0.555 mana drain per raw damage point.
Assuming no PDR, with 74% absorb each point of raw damage does 0.26 damage points. So you would need 0.555/0.26 = 214% DtM to see no mana drain at all.
ES + DtM is not exactly designed to be a complete lock. The better your absorb from ES gets, the harder it is for DtM to keep up with it.
[edit] When doing maths in public, you shouldn't try to do it too fast :doh:
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