Okay: SPOILERS IF YOU WANT TO LOOK FOR THIS YOURSELF!





Traitor Tester: look for breakable walls until you find a pig, SirOinks, put him in the hole near the tester. NOTE: he is important

There is a breakable wall by the furthest wood beam in a part of the map. Holds 3 of Mei's Super Secret special Snowballs, that break into cobblestone if shot. Not sure what this is for or if it is jsut a fun silly thing.

Now the big boy secret: in a room with bunch of ores, there is a obsidian button. Click on it and you get a hint of where diamond ore copy spawns.
So far we've seen 5 different ones, one of those we couldn't find, something about "Keeping fire alive through the night".
Find that ore and bring it to the enchanting table room, nothing happens there. So go out of the room, turn left into a traitor trap room with a fireplace. Put ore in fireplace and you get message "I 'enchant' not".
Find SirOinks, and bring him to the enchanting table. And voila, door is now open to a stash of weapons and a traitor trap for credits.