Please change the placeholder system! It is so discouraging when you need to kill 5 hours every 20 minutes a placeholder for the end to kill a boss does not drops what you need.
My Suggestions:
- Reduce the respawn time of the placeholder to 5 minutes
or
- Make a 100% spawn of the Boss and after bosskill a 100% spawn of Placeholder, like PH - Boss -PH -Boss-....