Why/How can Arno see his victim's memories?

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Perhaps I missed something important, but, is it ever explained why/how can Arno see the memories of the people he kills?
At the end, he even speaks with Germain (consciousness?).
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Why did Arno become a master assassin?
Wracked with guilt over his past failures, Arno joined the Assassin Brotherhood in the hopes of avenging his biological and adoptive fathers, while also working to uncover the true instigators of the revolution.Why Arno is the best Assassin?
He is probably the most fit assassin we've played. His parkour was the best of the assassins, his manuverability was the best and his stealth was also the best. He could go in and out of landmarks killing many guards and high ranked targets without being seen and glide across rooftops out of danger.Is Arno an ancestor of Desmond?
Arno is the third of four playable characters not to be related to Desmond Miles, with the first being Aveline de Grandpr\xe9, the second being Ad\xe9wal\xe9 and the fourth being Shay Cormac.What happens to Arno after unity?
Following Elise's death at the end of Assassin's Creed Unity, Arno falls into a deep depression, finding little to live for. No longer a part of the Assassin Brotherhood and no longer fuelled by revenge, Arno drank away his days in the French countryside.Assassin's Creed - Why Didn't Arno Hunt His Father's Killer?
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Images: Matheus Bertelli, Ylanite Koppens, Ylanite Koppens, Subin