Well... the problem i just found out is that the reguirements for the new Extreme Missions, (except for the Nightmare Crisol) are really high!
I don't think that this is actually going to be a really problem for high rank players, but the same way, it's not a really benefit for them...
The point that i wanna get with this, is that these missions are most likely to be a help for low/medium rank players.
With this said... we should agree that this requirements are really high for them...
-A medium rank player is obtaining around 20 Competitors Coins per Hour, which means if you are saving those since 60 days before the event, you are going to get 24x60x20 = 28.800 Coins, which is not even closely enough to complete the last part of this mission... And this is considering that you noticed what this mission is about 60 days before.
I repeat, i know that this is not going to be important for high rank players, 'cause you may have a lot of points before, or you can get enough points in a short time... but this kind of missions in a game are for low players (The example is, in case that you already have Ursula, maybe even already 5*, it has been a little boost for your gampley, if you get those 150 Soulstone... it means kinda nothing, but for a low player who doesn't has it, it's going to be a really high boost).
Hope you give me your comments about this, and if it's possible, we could report this to Lilith and maybe make these requirements lower