2nd encounter challenge on master was harder IMO. Keep in mind you keep the nut on the ground until somebody needs to kill an hourglass (the taken knight). The nut is the worst relic for killing so keeping it on the ground until needed allows for another person to be shooting rockets and supers at important enemies.

Haha yeh we did that in room 3. I did Challenge twice for Caretaker and Exhibition - hoping our CP for Rhulk Master stays for next week!!