just did a mogushan vaults solo and i gotta say, at 685 its very challenging still, several bosses took me multiple attempts and had to make alot of gear/talent/spec changes and experimenting to kill them
gonna start clearing it every week as mage for chance at elegon mount i guess
it is rough without the old content buff on, so 5m health still requires you to do 5m dmg regularly, and msot boss melee attacks hit for 10-20k so its definately rough but if youre above 680 id say its doable
some tips i had on the clear
1. stone guard LOL COMBUST
2. feng, brute force, block off the flame debuff going into arcane phase
3. garajal, i used all CDs on pull but then used a combo of alter time and evanece to survive his soft enrage, mirror images do not work
4. mirror image tank 1st king, kill subetai with lust still up so it goes by in like 20s, the 3rd king is the RNG part, you prettymuch need to get the shadow guy 3rd because mengs MC dot will tick till the fight ends (idk if its ice blockable) so getting him 4th helps, also meng does alot of melee dmg and relfect dmg so if you get him 4th, and you kited the shadow guy for quite a bit, mirror images will be back up
5. elegon theres 1 ways to do this from what ive determined
Item level 660-675: burst him to 85%, MI tanking wont work but getting him to 85% asap stops the melee. next stay in this phase for 2-3 rounds of orbs and get him to about 55% then transition. kill pillars pretty easy, blink thru fire walls, you can kite the adds with ~110-120% movement speed and use arcane explosion (glyphed) to kill them withuot taking damage. after this you instantly phase him again to 50%, here you stay in thsi phase until he dies, killing maybe 2-4 add waves. if you dont kill him here its fine, as long as hes below like 15% just do the intermission again and finish him
Item level 675+: phase him to 85 and kill him in the intermission phase. still lust on pull, took probably 4-5 add waves to do it then on 5th i think i just stood and burned and he died right before floor fell. like i said i was 685 so maybe at like 675-680 you will phase him at ~15% and just do the intermission and come back in.
note, i think phasing to 50% in this strat during intermission will reset the ball speed but dont quote me on that because this happened after 1 wave of balls for me
6. will of the emperor. i havent done it yet but im 99% sure ill be able to do it as fire with a bit of RNG, just need to get a good combust and then get them into dance phase and get some lucky 2x dance combos and kill them before the begin meleeing you again (cuz they hurt) id say theres no way the boss phase can last longer than the duration of time warp or you will die, that combust has to kill them so prettymuch full mastery and pray for a 4pc proc then use the double combust 2pc trick to get like a 3m combust and flat out kill them both (shared health)