The light crystal required to fuse to the lantern isn't showing up, is there a way to fix that? Also the tavern guy is bugged and i can no longer talk to him.
After fusing the lantern and the crystal, a new object is obtained, a glowing lantern, the original objects disappear, the owner of the laboratory spoke about this.
The bartender usually does not give new rumors if it is impossible to give you a task under your conditions. This happens extremely rarely.
Therefore, look in your inventory for a new item and go visit your gray friends.