If you ask any Eaglercraft veteran, they will tell you: "Avoid 1.12.2 servers for PvP." Here is why 1.8.8 remains the meta.
For friends to connect, you need:
Playing is as simple as visiting a website, but connecting to a specific server requires a few steps: I Tested 3 Eaglercraft Servers to Find the Best One 1.8.8 Servers Eaglercraft