Party only quests/zones ???

Loving the game at the moment. Just unlocked parties in my world and have noticed that the group of 4 kill the mobs easily. I have tried to make the mobs harder but then they kill the players too easily.

A suggestion that I have is that Mob zones can have a party only mode or quests can only be accepted by a party. meaning these zones/quests can be much harder.

keep up the good work.