The 75 rep for some of these really really really really is not worth the hassle involved, like the aqir colossus trophy or whatever it is.
The rep rewards, or the time invested, needs adjusting imo.
Also are these rares even capable of dropping anything?
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It appears to be "do 100 things to fill a bar", each thing granting 1% or less for trivial mobs. Grindy to be sure.