well, i had the problem most 5-2 (knight) players have. They only give you 8 advanced orbs, and you need 15 to progress. This is how I did it
STEPS
1. get all 8 orbs
2. upgrade/ make a helm, armor, and a sword (if you don't do this it won't work. also, you need 1 more token, and a trip to the auction house with 6k would cover that)
3. get friends and replay the jelly boss level until you have 20 tokens (and save more than 15k)
4. buy the antigua (3 star gun)
5. use your 15k and convert it into energy (you should get 200)
6. buy 3 advanced orbs
7. DONE!!!
P.S: you can get a few orbs from a friend
~The-Rising-Blade
You actually only need one 3 star weapon to progress. So you could skip crafting the sword or trading the tokens for the gun.