Holy Pallies and threat

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There was a question about back enchants for a pally healer.  After looking it up and reading a bit on it I can say that it isn't a worthless enchant, but it is definitely the least effective for a pally healer.

Threat works on the principle of 100 points of damage = 100 threat (or 1:1 ratio). 

Blessings, talents and other stuff can modify that so that either more or less threat is generated, usually based on the role of the group/raid member (tanks look for more threat while dps looks for less).

As far as healing goes, 100 healing = 50 points of threat.  All overheal is ignored.  So healing for 200 hps but 100 of it being overheal you'll only receive threat for the healing done (100 healing = 50 points of threat).

Pallies have an added bonus in that 100 healing is actually only 25 points of threat (50% of other healers). 

This allows us to take talents like "Improved Righteous Fury" and put it up and still remain under other healers base-threat and take 6% less damage (woot).

100 healing = 25 threat * 1.9 = 47.5 total threat

This also means that if we are the only pally in a group or there are only holy and prot pallies around we don't need to worry about salv on pallies (although ret pallies NEED salv).

Finally, why i think the -2% threat isn't worth as much.

Assuming we are not using Righteous Fury and no other threat modifiers working for/against us:

100 healing = 25 threat - (25 * .02) = 24.5 threat

so we don't benefit nearly as much as anyone else who uses that enchantment (DPS benefits the most).

For example: 8000 heal holy light = 2000 threat - (2000 *.02) = 1960 threat