No soloing portals on hard mode? Seriously? I do that all the time. Two or three hits with maxed gjallarhorn and the gatekeeper is dead. We usually snag both relics at the same time like that, it's way easier. 2 guys on each pad, one man in each portal. When we get out everyone rushes the center. By far the easiest way to do the portals on hard mode. You don't have to kill the adds in the portal (except the one that spawns by the relic), just kill the gatekeeper and run past them. Actually the hunter is best suited for this because it is so quick. But honestly any class can do it