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2% if i remember right so you would get 200 threat for every 1k threat you already have.
*twitch*
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From most comments I've read today, the threat enchant is very useful, as it increases threat gained from all abilities. So, for instance, a Thunder Clap will get 2% extra threat on all mobs. With this enchant and Defiance, you would have 17% extra threat on every attack.
Eh... yes and no. Looking at base threat, it's actually Base * 1.3 * 1.15 * 1.02 = 152.49% more threat. Threat is multiplicative.
The other way to look at it as it's 2% more threat than you're currently producing, which is usually the better way to do it (and it's why claims that "threat reduction doesn't stack" are bogus, but that's another issue). Without the enchant you get 149.5% more threat, with it you get 152.49%. 152.49 / 149.5 = 1.02.
The same, incidentally, applies to Subtlety to Cloak and Berserker (or Battle) Stance/Imp. Berserker Stance/BoSalvation/Tranquil Air. While if you look at base threat you're getting smaller and smaller returns with each stacking effect, you're actually getting exactly the listed % change - going from 80% threat (non-Imp. Zerker) to 61.54% threat (+BoSalv) means you can do 30% more 'threat' and still be at exactly the same place you were before.