Originally Posted by Scrufola
That's correct. But my question was, what if you use the glyph but only use it once.
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Oh, sorry, misunderstood, well i guess depending on haste (i sit around 20%) it could be different, but the math should look something like:
Assuming no haste:
Casting immolation with "6" seconds left you will get at best 5 ticks. Lets say each tick for you is ~ 1300, that means that GCD yielded a 6500 damage cast. Which dependent on gear, (and if you had 0 haste I am assuming) should be one of your highest DPS spells in that situation.
Assuming a raid buffed 20%ish haste:
Immolation with "6" seconds left in meta and each tick at (1/1.2) or .8 seconds will be ~ 7 ticks, which (assuming the still 1300 damage tick) yields 9100 damage cast, which is definitely worth the cast if you are in melee range.
The mana issue I think is a bit moot, as, you should be life tapping every 20 seconds to keep the glyph up, and I have yet to run out of mana while doing this. Also due to the nature of many ulduar fights, I find with the overabundance of run time on most of the fights you have plenty of time to tap while moving making the mana even more insignificant.