All common resources for mission writing are available here. This includes Costumes, Groups and Bosses (Boss-AV ranks). A listing of Mission Arcs is available here, but the source file for arcs will only be available on request. Please follow the Upload and/or Download instructions carefully. This post will be updated periodically to include groups added in response to this post.

Upload Instructions

1. Please subscribe to our Google Group here. The group will only be used for hosting files for our mission writers. Subscription will not be required for downloads.
2. Follow the instructions for subscription (a simple email confirmation).
3. Once you are subscribed, sign into the site and click "+upload file" on the main page. Browse for the file(s) and upload it to the group.
4. After you have finished uploading all files, return to the google group's main page, find your file(s) and copy the link location(s).
5. Reply to this thread with this format:
   Name:
   Description:
   Ranks: (optional)
   Unlockables Required:
   Download Link: -insert copied link here-

Download Instructions

1. Right-Click on the file you wish to download, and choose "save as."
2. Costumes (.costume) - Save the file to your (COH install directory)/Costumes folder.
3. Custom critters (.critter) - Save the file to your (COH install directory)/Custom_Critter folder.
4. Custom Villain Groups (.cvg) - Save the file to your (COH install directory)/CustomVillainGroup folder.
5. In all cases, you do NOT need to type in the extension name.

Costumes

Custom Groups

Name: Hollow
Description: "Cannon fodder" of the enemy. Note: The Hollow are composed of non-humanoid creatures already in the game. The spawns of this group will change dramatically depending on the level range the group is used in.
Ranks:

Spoiler:
	Spawn (1-54) Herdling Lasher (5-10) Magmite (?) Magmite Lord (?) Ghost Son (?)

Unlockables Required: None
Download Link:

Name: Order of the White Flame
Description: Mystical sect that initially clashed with the first Shinigami scouts to Paragon City.
Ranks:
Unlockables Required: Auras
Download Link:

Name: Onmitsukido
Description: The secret Corp of Soul Society, specializing in stealth.
Ranks:

Spoiler:
	Minion: Mappai (Katana|Ninjitsu, Standard|Standard) Minion: Mappai (Claws|Ninjitsu, Standard|Standard) Lieutenant: Shoui (Energy Assault|Super Reflexes, Standard|Standard) Boss: Shuhan (Katana|Energy Aura, Hard|Hard)

Unlockables Required: None
Download Link:

Name: Soul Reapers
Description: "Cannon fodder" Shinigami, part of the masses that are frequently and soundly trounced.
Ranks:
Unlockables Required: None
Download Link: CVG File (contains all 7 custom characters)

Stand-Alone Custom Critters/Bosses

Name: Vice-Captain Yanagai
Description: The Vice-Captain of the Kidou Corp, Yanagai first appeared in the villain arc "Song of Exodus," where she was defeated. Little is known of her background, but it is clear her kidou abilities are as powerful as one would expect for her rank and specialty.
Powersets: Ice Melee (Hard) | Forcefield (Hard)
Unlockables Required: Magic Booster Pack II | Valkyrie Costume Set
Download Link:

There's a solid tutorial about which directories these files go into here, as well:

http://wiki.cohtitan.com/wiki/Mission_Architect_Files