Overview
How to get a free class in trove!
Requirements
You must not have used one of these guides before, and be under mastery rank 20. That’s about it.
Steps
Go to [link]. You should see something like this:
Click sign in, and sign in to the same account you use to play Trove. Click on the apply code tab under account. 
Then, just paste the following in: 7JKECHHDCM9PF2TKEDEW
