Because private server developers are often passionate fans, they add things Gameforge never did:

Most Gladiatus private servers advertise the following changes:

Introduce a new color/tier above Orange (e.g., a glowing Deep Purple or Cyan ).

While most Gladiatus private servers are simple PHP/MySQL websites, some malicious ones ask you to download a "custom client" or "anticheat.exe." This is almost always malware. Never download an executable for a browser-based game.