Goblin King?

[Nikita]

Now I understand what you're asking man

They didn't change anything about the quest combinations. For Goblin King, the combination is still: Goblin's Skull + Crimson's Necklace.
Overall, you should know when creating a room and then setting "Quest" game-mode, an automatic list of quest combinations will be displayed immediately:

https://i.imgur.com/2hdAWQ8.jpg

Thanks boss <3