Overdell Cemetery & Grey Lord's Mansion - Digimon World 1
Overdell is an area found in the northern part of the Tropical Jungle; when you enter the area keep going north to find the Overdell Cemetery and Grey Lord's Mansion. East of the Overdell Cemetery is where you will find the Great Canyon Entrance as well, this is another area we'll be exploring soon.
In order to enter Grey Lord's Mansion you'll need a Virus type Digimon. These include Numemon, Sukamon, Kuwagamon, Metal Greymon, Megadramon or Devimon. Don't worry about exploring this place with a Numemon or a Sukamon, there are not many difficult fights throughout and you'll mostly be opening doors, learning the route and gathering items.
The 'main event' of Grey Lord's Mansion involves finding and helping Myotismon. You will need to help Myotismon in order to recruit Skull Greymon later. Follow my steps below to complete the story event of Grey Lord's Mansion.
Helping Myotismon Step-by-Step:
1. Find the Dining Room & loot the Mansion key from the fireplace.
2. Search the rooms until you find stairs that go up into a computer room with two Rockmon.
3. Explore the bottom right area of the computer room; you'll fall through some grates in the floor.
4. Inside of the adjacent room you'll find a coffin, inspect it to be taken down into a new area.
5. Myotismon can be found lying on the floor in this area, talk with him to get the Refrigerator Key.
6. Use the key to open the fridge and you'll find a note; exit the mansion to find the Steak outside.
7. Return to Myotismon and give him the food.
Bakemon
Requirement: N/A
You will find Bakemon roaming around the Overdell Cemetery in the southeastern portion. Speak with him and answer "YES, YES, NO" to make him join your city.
Skull Greymon
Requirement: Shellmon Recruited, Saved Myotismon, have 40+ Prosperity Points & Most importantly have a Virus Digimon
To initiate this quest the first thing you need to do is read Shellmon's Bulletin Board, Article #6. You'll learn that Myotismon has gone missing - in order to do anything about this you'll need a Virus Digimon. Preferably you're going to want a Champion level Digimon or better for this quest since Skull Greymon isn't a push over.
I did this quest with a Sukamon because I went out of my way to unlock Filth Techniques (fight the enemies at Trash Mountain with Sukamon) and I brought a lot of items. When you're ready to tackle this challenge you'll want to return to Grey Lord's Mansion and follow the steps below.
1. Search the Dining Room
2. Search the lab under the study (where you first met Myotismon)
3. Try to leave the Mansion and Devimon will spawn (if you teleport out, upon your return he will confront you inside the Mansion)
4. Once you speak with Devimon, the door to the right when you enter will now be unlocked. Use it to visit the Secret Lab
5. Find & defeat Skull Greymon in the Secret Lab
6. Speak with Myotismon in the room prior to Skull Greymon (he's passed out on the floor in the bottom right corner)
After defeating Skull Greymon, all that's left is talking to Myotismon and they'll join your city.