I've recently gotten over 40 with my SCH, so I'm starting to occasionally be in PTs with RDMs. I tell them not to bother Refreshing me, since it doesn't stack with Sub, but I'm starting to wonder if that's the best idea. In situations where the RDM has a full load, with PLDs and multiple mages, at least I'm taking one for the team (and I do my part to lessen the load with regens), but I'm begining to wonder which is actually more efficient. Refresh has the advantage of allowing me to rest while the only way I can rest with Sub up at this range is with Earthen Ward. Sublimation always gives me more MP than Refresh would (Refresh only gives 150, while Sub will give 170+ depending on lvl and HP gear), but at the expense of a greater amount of time which will only get longer, even when I get AF hat (though by then, the rate will pick up to match that of Refresh, not to mention being able to use SS with /WHM.)
I suppose, depending on the RDM's Refresh load and which role I'm play, which I should lean to could change, but I'm not sure what I should be doing most of the time.
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