I made it to,the 4th battle, but don't have enough power points to go any further
Either upgrade and evolve your current equipment or get more equipment for your heroes. Each equipment adds up to the total power you have. So for example if you have 3 equipment with each at 10 power points, you will have 30 power in total.
Upgrading seems to give a larger boost. There is also a free event in the news tab. You can get another lightning blade as well as experience stones. With that you should have enough power to get to the last level with the boss since it only requires 24 power.
made a video that will show you more on el dorado
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