Haha, I also thought the erosion rate always being zero was a bug. Actually, it's because collecting a certain number of color-matching cards gives you bonus effects. The third type — blue — when you stack 5 of them, reduces the erosion rate growth by 5.For the 403 error, I just need to toggle my VPN, such as 1.1.1.1 on and off to bypass that error. There's also a disconnection error during a match, which interestingly disappears if you let the match continue and finish lmao
Additionally, another error I can't remember the number that helped me clear 100 floors of the Abyss is the erosion rate was always at 0