NOTE: Most of the moon dagger quest requires it to be night time, so if a mob is not responding correctly, make sure it's night before trying again.
Visit the old druid trans in Roman Britain at night to trigger an extra phrase. (something that includes the word 'flagitious')
ask druid flagitious.
He will ask you to find a moonstone.
ask druid moonstone.
He will tell you that a group of desert shore people used to worship moonstones and might be able to help you.
Visit the zombie in nazca at night and ask zombie moonstone.
He will whisper to you to bring him some moon dust.
Go to the theatre in the carnival and go north behind the screen to get the moon dust from the floor.
Bring the moon dust to the zombie (at night) and he will ask you to visit him far in the future where he will give you the moonstone.
Go to H.G. Wells and do the time machine quest. He will ask for a fuse, bring him the fuse from the Dartmoor quest. The zombie will meet you in the future during this quest and hand you the moonstone.
Go back to the druid trans at night and give him the moonstone.
You will get the ancient moon dagger!
Visit Helga with the ancient moon dagger in your inventory and she will mention something about Mani. Ask Helga Mani and she will tell you that Mani is searching for a meteorite.
Go 2e s e 3n from Helga (at night) and Mani will appear to you and ask you for a meteorite because Ragnarok is coming.
Find a meteorite and bring it back to Mani (at night with the ancient moon dagger in your inventory).
She will take it and swap your dagger for a new dagger!
Go to Nell at night and she will mention worshiping Selene.
Go to Selene at the Shrine Among the Fierce-Girt Trees in Greece at night and she will ask you to complete a few tasks and bring her the gray fragments from each task.
She will give you three hints, you must:
Note: the fragments will only last 24 in-game hours. So finish all of these tasks in one night and bring them back to her before they poof.
Bring the fragments back to Selene and hand them to her one at a time. Wait for Selene to list your remaining tasks before handing her the next fragment.
She will ask you to do one more task. ask Selene task. She will tell you to bring the three fragments to a moon-crowned statue in a temple somewhere.
Go to the temple of Khons in Egypt. (e 3s w from the Dock in Ancient Egypt)
Upon walking in, you'll receive the crown. Bring this crown back to Selene and give it to her.
She will ask for one final object. ask Selene object. She will ask for the dagger of Mani. Give her the dagger you received from Part 2 and she will give you a moon dagger!
The dagger and whois you receive from the final part is dependent on the season when Selene gives you the dagger.
You can check the current season using the weather command.
Spring: blue moon dagger
Summer: blood moon dagger
Autumn: harvest moon dagger
Winter: hunter's moon dagger