Supercell never continued the story of the Goblins. So i have an idea to continue it.
What about Sherbet Towers isn't the last level?
There will be more levels until the boss battle (Goblin King)
After defeating the boss battle. The Goblin King says:
"You are a worthy opponent. I surrender, and i will serve you, for a price."
The Goblin King is be a mix of Goblin and Barbarian King. It is slightly slower than a normal goblin. And it targets loot. When it attacks non-resource buildings and walls. It drops bombs.
And to make it more challenging, everytime you lose the battle. The Goblin King will take 2% of one of one of your resources. He will say "I have defeated you, now you will pay the price for battling me. Gold or elixir?"
Once you defeat him, he is unlocked in the Store. He costs 30000 DE.
Name of Level ideas:
1. Shocking Entry - Lots of Teslas
2. Dark Doom - First level with Dark Elixir
3. Rapido Blazo - X-bow and Inferno Tower
4. Magic Zone - Maxed out Wizard Towers
5. Royal Confrontation - Boss battle