I'm not voting for Soul Snatcher because imo, it sounds way too much like stealing creation. I think the storm astronach idea sounds best. with the agility update being much needed also.
If soul snatcher wins (hope it does) maybe you could also add a toggle on/off for the boss monsters so this minigame would also count as a clan wars as well somehow
-would have to increase the amount of players allowed in a game to like 50+ or something for clan wars mode
Can we pick them all? honestly they all sound good because it's fresh, custom content. I know we can't so I'm going to go with The Cat Mystery because I personally love questing and I would go nuts if we had new quests added.