Goodbye.

Background
In "Accepting the Truth," Mark and Ethan announced an upcoming twelve-hour long livestream set to conclude Unus Annus' one year run, starting on Friday, November 13, 2020, at 12pm PT. The event was organized by Real Good Touring.

Summary
During the first few hours, Nestor and Fischbach discussed the process behind the channel's creation, rewatched and provided commentary for their content and later showcased the editors' hand-picked gag reel compilations, including their commemorations and music videos, followed by a short interview with all four of them; Vicente (@Dicerolltv), Rachel (@rad_R) and Marcus (@yofriendmarcus/Nerd Fiction), and Lixian. Alex Tima also sent his own video honoring the channel and DJ Blackarach gifted them a bottle of wine and a medium-sized cake. Halfway through, they interviewed Stevie Hopkins, Unus Annus' merchandising manager from Second City Prints.

Throughout the broadcast, Mark and Ethan encouraged the audience to share their works one last time and interact with them on Unus Annus social media using the following hashtags:
 * #UnusAnnus and #UnusAnnusIsOver or #UnusAnnusIsOverParty - Sharing fan art and memes.
 * #UnusAnnusOutOfContext - Fans would post out of context screenshots and snips from various Unus Annus-related videos.
 * #WeWereHere - Used by fans to showcase their first viewed videos with timestamps to indicate their favorite moments.
 * #TattusAnnus - For fans to showcase their Unus Annus-themed tattoos. Nine hours into the stream, Ethan got a commemorative tattoo of Unus Annus' clock on his inner upper-left forearm. The timer tattoo was done on a short notice by Danielle Skye (@danielleskyeee).
 * #MarksNewHat - Mark showcasing his newly acquired white top hat.
 * #MementoMori - With one hour remaining, the two ask the audience to send them their final goodbyes before the channel's deletion.

During the eighth hour mark, the screen displaying the timer shut down by itself for a brief moment. This turned out to be a prank, with Nestor and Fischbach teasing the members of their audience who wished to stop the clock and prevent the channel's deletion.

Within the last fifty minutes on the clock, the two begin to slowly remove their social media accounts by deleting its contents and making their profiles private, in order to make sure that no one attempts to masquerade as them. The order of account deletions is Instagram, Tumblr, Twitter, and Reddit. The Unus Annus merchandise website ceased operating post-stream, with its main page changed to reflect its offline status.

With forty two minutes left, Mark and Ethan accumulate over 1,000,000 likes and viewers and, as previously promised, showcase their custom-made Unus Annus coffin. The three later take turns lying inside it. According to Ethan, the casket's design cost somewhere between 4,000 to 5,600 USD.

As the time is about to expire, Mark, Ethan and Amy say one last goodbye before shutting down the channel together. The final stats for the stream sat at 1,5 million concurrent viewers and 12,3 million overall visits, with 1,05 million likes to 3,2 thousand dislikes.

Quotes
"What is every graveyard, but humanity's hall of fame."

- Mark

"See you on the other side."

- Mark and Ethan's last words upon deleting the channel

Trivia

 * The two figures in the thumbnail appear opposite of each other's usual positions; Mark standing on the left and Ethan to his right instead of vice versa.
 * The spiral behind the small television set appears as an outward spiral, rather than their regular Archimedean spiral. Mark noted that this was a technical oversight.
 * The livestream accumulated around 12.3 million views in total, making it the most viewed segment on the Unus Annus channel. In contrast, the most viewed standalone episode was "We Force James Charles to Run a Military Obstacle Course" with slightly over 12 million views.
 * The rewatched Unus Annus videos include "Unus Annus", "Cooking with Sex Toys", "Mark and Ethan Attempt an Escape Room", "We Eat Bugs", "DIY Geriatric Simulator", "We Got Pepper Sprayed", "DIY Chiropractor", "Being Attacked by a Fully Trained Bodyguard Dog", "2 Idiots Get Crushed by 18-Foot Giant Snakes", "We Found Websites That The World Forgot About", "What the Hell is a Pink Trombone?", "Pee Sauna", "Becoming the World’s Greatest DJs", "Mark and Ethan Go Casket Shopping", "Fixing Mark's Hole with Ramen but Every Time We Add Glue We Get 5% Closer to God", "The Beginning of The End", "Playing Children’s Games in Total Darkness", "Too Many Pickles", "Hunting HeeHoo", "Ethan Kidnapped Mark", "The Truth of Unus Annus", and "The Barrel - Official Music Video."
 * At one point, Mark claimed that there is hidden lore behind Unus Annus, stating that their fans have yet to find all the clues. This was likely meant to be taken as a joke, as Mark and Ethan have stated on multiple occasions that, despite leaving multiple Easter eggs across various videos and their fans' insistence, there is no deeper meaning behind the channel. Prior to it, they took jabs at MatPat's Unus Annus theory video in a playful manner, which proposed that Mark and Ethan's Unus and Annus personas are separate entities, influencing their decisions within the channel's world.