In Deathloop, learning how to kill Aleksis will always take patience, becuase Aleksis will always be one of the last Visionaries you'll kill. You can only get him in Updaam in the evening while he's hosting his masquerade. In classic Arkane fashion, you'll need to do some leg work in order to spot Aleksis in a crowd of party-goers that are dressed a lot like him. Also in classic Arkane fashion, there's more than one right way to do this. Here are two different strategies if you're wondering how to identify Aleksis at the party in Deathloop.
As mentioned, your only shot to get Aleksis seems to be in the Updaam (evening) level. He'll be hosting his party at the mansion on the opposite side of the map from where you emerge out of the tunnels. Aleksis may think he's hosting some sort of Kubrickian gala, but you're there to ensure it's more like Poe's Masque of the Red Death.
There are two main ways you can identify him under his wolf mask. One is to get him dancing, the other is to get him annoyed. Let's start with the former.
Aleksis is a self-centered dude, and one clever way to get him to unmask himself (figuratively) is to play his new music he's been working on. First, you'll need to figure out what that beat is. Approach the mansion from the side you see in the image below--it's just across the rocky gap behind Otto's Workshop. Ascend the mountain and enter the property through the vantage point circled below.
Head out the opening in the wall to your left, then walk along the snowy perch until you can leap over the broken wall and go up the stairs. You'll be on a rooftop outside, not far from where Aleksis will be lingering, but you can't spot him without a little guidance. In front of you will be a white door, which
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