I got a quest I fought nightshade then I saw a death () gate I wondered what was inside I looked it up on youtube but it never showed what was inside I got annoyed and at the end of the video it said to message on the messaging boards to get it unlocked please comment and tell me whats inside...
The Death gate is probably a decoration for the Haunted Cave to make it seem more intimidating. After all, the Haunted Cave issupposed to be "haunted". If I am wrong, (which is highly possible) it is likely to play a part in a Death spell quest. (Though I've had no notice of any Death spell quests involving the Death door.)
I think you have to do some quest or whatever to get a key to the door so you can get in. I bet its like , mallistaire's secret lair or a secret underground death school. There is another one under the waterfall in the commons. I looked up some cheats to get past the one in the waterfall but they didn't work.
It's for the new word or zone or just a battle, next major world after Azteca, last world of Morganthe. Dalia Falmea said pretty much in this https://www.wizard101.com/game/producers-letter-august2013(go down till you see"Click Here For A Special Sneak Peek"). She says-
Our 5th birthday will bring a major flashback for our earliest players, but with a twist – not to mention a lot of fun for everyone.
Something new and spooky this way comes -->
What you find in the next major world after Azteca will rock Wizard101, and things will never be the same.