I'd assume catching up on stuff hadn't bothered with before. Unless I'm missing something the best trial during half price campaign is ~ 195 rank xp/NRG which is about the same as any number of newer explorations and less than a couple older ones. Meanwhile without even getting the 1/2 nrg LGD Armageddon is 400... hell ELT is still 200. I should get on that but I still haven't started it farming events so much lately lol... hell still haven't gotten around to Lich either. Probably largely due to wanting to get crysts accumulated and all these reruns are 100% farmable for me