Briefly: Return To Boletaria is an event to encourage players to play Demon's Souls, and it is going on right now. It runs until December 7. You can learn more on the official Reddit thread, including directions for using a private server so that you can access multiplayer.
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Briefly: The Bloodborne community is hosting an event to encourage cooperative play in the game. Running until the end of the month, The Blood Moon is geared at encouraging veterans to come back to the game and getting new players to check it out. You can learn more about the event here.
Briefly: Forces Of Annihilation, the mod for Dark Souls 3 that allows you to play as the game's bosses, is available now. While not all of the enemies are currently playable, the developer is continually adding more to the mod. Check it out.