Please try erebus, normal build and then this proposed build.
Then come back here and tell me that this supposed "imba" build performe better that the classic one.
We can arrange a match and ill show you hands down that classic erebus owns "mist build" 100% of the time.
The screenshot you provided show really nothing, your team was clearly better, with or without you in mist build.
Proof is the other team erebus that died the most, when erebus is one of the most easy to survive with.
Really we are talking about nothing imho.
Actually, I think you are missing the point. This isn't about a "mist build" this is about how w/ just 4 helms you can essentially become invulnerable for the rest of the game as long as you are careful while providing some interesting tactical feats w/ mist.
The game I linked w/ a scoreboard screenshot was the class "bite/bats/charm/mist" build from what I've seen. It was just a test of survivability in a low health / high mana regen state. As you can see from my assists I was very involved on the front lines but I had no problems staying alive. People were asking for me to try the max mana regen in PvP, so I did. That's all the screenie was about.
I don't mind arguing the tactical limitations of mist itself, even if you can make it everlasting. However, it's kind of annoying for so many people to post in the thread without REALLY reading the OP and all the discussion that has followed.
Mist itself is not going to win most even a plurality of games. Erebus seems to be a character where all 4 of his skills are immensely useful (unlike some other DG's, I have found). But let's go back to the original question, "Is misted intended to be a permanent state at the will of a player as long as he stacks enough mana regen?"
Let me also restate what I think is key about all of this and that is by excessively stacking mana, normally you are trading off some survivability b/c you are not filling slots w/ stam and speed. However, w/ Erebus the opposite seems to be true once a critical level of mana regen is reached. Should it be that way as a design feature? That's the question.