After the events of the last quest in the series Genshin impact.
See article for full guide. "All Ghosts on Tsurumi: Where to Find, How to Start and Complete Quests".
Where to find Abe's ghost in Genshin Impact
The ghost is in the ruins between Sirikoro Peak and Tirai Shrine.
In order for the ghost to appear, you need to collect all the glowing mushrooms nearby Thunderbird puzzles at the flooded stairs.
Talk to Abe.
Abe's order
After 48 hours of real time, when the glowing mushrooms reappear, return to this place. Collect all the items to talk to Abe. The ghost will ask you to bring new types of mushrooms.
Approach the phantom and give him three simple mushrooms and three filanemo mushrooms.
Awards
For helping Abe, the player will receive a Rich Chest.