What is the world boss and how do I fight it?
Sorry for sounding like your Dad here, but… You really need to build a better foundation before rushing into the Rift. IF you can beat the GB10 effectively and get to at least LVL70 of TOAN then you next goal is the Dragon basement. But honestly if you haven’t completed the scenario yet then you need to focus on arena farming as a first priority. The bonus buildings are fundamental.