ArcheAge Chronicles: Title: Main Quest Blocked - Slith (巨蛇座斯林) Will Not Respawn After… (Workarounds)
Short answer
Suggested fix (unconfirmed): Create a new character to bypass the bug, as it is an early access game.
The problem
Hello Dev Team, I encountered a critical progression bug with the boss Slith in the Serpent Constellation instance. I defeated Slith ahead of the main quest trigger. Now the main quest that requires defeating Slith cannot proceed. After resetting the instance, relogging, switching channels and clearing all monsters in the dungeon repeatedly, Slith still never spawns again. The quest is stuck…
Suggested fix (unconfirmed): Enter the area from the cliff side with the door at the wall to trigger the doors to open. Alternatively, complete all Lone Splinterstar quests to unlock the tower.
Suggested fix (unconfirmed): Disable VSync and cap your frame rate in the Nvidia Control Panel. Lower the shadow quality and object detail settings in the game menu.
Suggested fix (unconfirmed): Find and defeat the boss "Gorehammer Kanuman" in the "Gylden Archives" dungeon. Complete the hidden dungeon quest she mentions to progress.