The original release was Defender's Quest: Valley of the Forgotten.
It was upgraded as Defender's Quest "Gold" Edition. Based on that, I have a few suggestions.
Defender's Quest: Valley of the Forgotten - Obsidian Edition (Obsidian skulls)
Defender's Quest: Valley of the Forgotten - Unobtainium Edition (Unobtanium skulls)
... - Final Draft
... - Epilogue Edition (Azra's a librarian)
... - Afterword Edition.
... - Addendum ("an item of additional material, typically omissions, added at the end of a book or other publication")
... - Boosted Edition (The in-battle level up term)
... - Crystal Edition ('cause of the crystals?)
... - Reimagined Edition (New art and story)
... - The Complete Journey
My favorite of the bunch by far is Defender's Quest: Valley of the Forgotten - Addendum just because it ties into books and accurately describes what the new update is about. But that's a big word. What do you think, @larsiusprime ?