Is there a website that lists briefly the classes and specs that have execution phases below a certain amount of health (e.g. fire mages) and also above a certain amount? (e.g. Markmanship Hunters)
Otherwise I'd have to do the research myself.
It would have to include both the explicit phases such as flat increases in dps and indirect effects that result to almost the same, such as 1 ability doing more damage above a certain health or below a certain health.