doomtower is a great feature, but I'm passed level 3 and 4 on artifacts
I love the doomtower, I think it is a great feature. However I feel that the difference between normal and hard is too big. Where I have no problems with normal, I have great difficulty with hard. I suspect that in the future there will be also something like brutal, nightmare and ultra nightmare.
With normal I only am able to get rewards from bosses which are good for level 3 and 4 artifacts. I am passed that and do not require anymore artifacts on that level. However, I got stuck at the second boss, hard, so I can only farm the first boss and though I do get some legendary items to forge with, of course this is very limited: I can't forge all the new sets with it
All in all, I really like doomtower, but I think it needs some tweaking to get the players the stuff they need on their level