First few days it was smooth but after that I was starting to run out of material to use. Heroes requirements for battle is way too much just to keep going in one spot. The hero level can be limited by the castle if it's not high level enough. Worst part is that the game DRAINS my battery very quickly for absolutely no reason and even overheats. In conclusion: boring, repetitive and unfair. Literally no guide to any of the systems.

Pay to win, but can still be enjoyable. There are events that you cannot complete without spending, most others are very difficult to win without spending even if you play 16 hours a day. Most items (e.g. Relics) that allow you to compete are only available through purchases. I have played with friends for six months. It is not a free to play friendly game. It is the people playing that make it enjoyable. The only competitive players in our guild spend over $400/month.

Gameplay doesn't match the images (images show a single-player adventure game). There's a small adventure element where you battle monsters, but it's very minor. The main game is competitive with elements of idle resource-farming & battle against other kingdoms/servers. As others mentioned, it's heavily pay-to-win and you won't win many battles unless you drop thousands in $. There aren't any gameplay updates after a server reaches S3, just more money-grab to make your characters stronger.