House of Angels is a Fallen-based expansion that I've been working on for around two years or so.
Faction: https://www.bungie.net/ga/Forum/Post/113363163/0/0
House of Angels would have these in it:
Five Story missions,
Three Strikes,
Twelve Exotics,
One Patrol Area,
One Patrol Event,
and One Raid.
Enemies/Bosses: https://www.bungie.net/en/Forums/Post/216279240
Exotics: https://www.bungie.net/en/Forums/Post/216024893
Missions 1-3: https://www.bungie.net/en/Forums/Post/199626164
Missions 4-5: https://www.bungie.net/en/Forums/Post/201003421
Strike 1: https://www.bungie.net/en/Forums/Post/199625836
Strike 2: https://www.bungie.net/en/Forums/Post/204939862
Strike 3: https://www.bungie.net/en/Forums/Post/216265621
Quests: https://www.bungie.net/en/Forums/Post/208636737
Patrol: Patrol Rhea
https://www.bungie.net/en/Forums/Post/206333730
Patrol Event: Angel Hunt
Basically, it's a new Wolf Hunt event. There would be bosses that spawn periodically in different areas on Rhea. The bosses are:
Eksut, Angel Captain
Baknil, the Hornet
Meksir, Angel Baron
Yarik, Angel Baron
Raid: The Angelship
https://www.bungie.net/en/Forum/Post/169148325/0/0
New Ghost ability: Servitor Scan
After the third mission, Ghost will obtain the ability to scan Servitors. They must be at roughly 1/5 health, you must be in a House of Angels mission, and once they are at 1/5th health you can press Square/X to scan it. You will gain a significant amount of Cryptarch rep and the Servitor will be killed in the process.
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Update: Changed the first Raid Boss fight, then slightly changed the final one. Also added the two Challenge Modes.