Originally Posted by janodandre
6.5% blood shield equals 1% avoidance, because 1 mastery mitigates nearly same dmg or more than 1% avoidance. The specific value of DS is irrelevant because it is % based.
Mitigation from blood shield: .20 * 1.45 * 0.5 = .29 * 0.5 = 0.145 (14.5%) of damage taken
Mitigation from blood shield with 1 more mastery point: .20 * 1.45 * 0.5 * 1.065 = 0.154 (15.4%)
You are DSing every 5 seconds, so you can view it as nearly 1% mitigation. Its value increases with magic damage taken, which may be around 1/5 for a fight (or so it seems looking at worldoflogs).
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Just about everything you have said here is wrong.
- The mitigation from Blood Shield is not "20% of damage taken times a 45% increase times 50% base Mastery Shield equals 14.5% of damage taken". That is not even remotely how you calculate the value of Mastery or its contribution in damage reduction, for a lot of reasons, the most important being that it clips itself.
- Unless you are stacking Haste to ridiculous levels and have perpetual Bloodlust, you are not Death Striking every 5 seconds. Runes recharge every 8.3 seconds. If you're lucky, you'll get good RE procs and be able to throw a DS out between Rune recharges sometimes. It is not a static value and treating it like one is incredibly inaccurate.
- If you're claiming 6.5% Blood Shield equals 1% avoidance because of my sim results earlier in this thread, you need to go back and read them again. They were found roughly equivalent on a per rating basis. Rating is not percentage, Mastery requires more than Avoidance and does not have DR.
But, most importantly:
- An increase of 1 Mastery is not "20% of damage taken times a 45% increase times 50% base Mastery shield times 6.5%".
It's additive. Gaining 1 Mastery doesn't multiply your base of 50% by 1.065. It adds 6.5%. 50 + 6.5 is 56.5. Even if your equation prior to that point was correct (and it's not), by doing what you did you are cutting the actual value of Mastery in half.