As a single player with 5 pro accounts I've soloed garanak acolyte, ignus the lava lord, queen ulrob, etc. I need to alt and reb several toons with specific skills and stats but I'm fairly confident I can do sreng now it's just hard to find a 30 min window with no one on to set up and try.A lvl 202 warrior soloed Comrak
Once my alt army is leveled i will be easily able to solo sreng no alt or reb and aggy.
Its a whole other level to single player hrung. We may need to wait for new higher level mobs before someone accomplishes this.