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I want (one of) them to play this: The Black Masses. It's made by the guys who made UEBS and uses an updated version of their uebs engine which can manage thousands of npc's at once.
The game is about surviving on an island full of zombies called 'the possessed', the former inhabitants of the island after a shipwreck. As you crash into the shore and lie in the sand, you are chosen by god to cleanse the island and find out what happened there.
There is a prety good parkour system whch allows to climb literally anything, the map is (in irl terms) at least 30x30 km big and contains cities, villages, fortresses and the so-called 'Towers' where some bossfights against the demons corrupting the island happen.
There is a wide variety of weapons including but not limited to crossbows, guns, swords, daggers and the like, not to mention the consumables and skills/skilltrees.
The game also doubles as a bit of a horror game - there are areas where you literally can't even see your own feet, and trust me you've never felt true fear until a zombie comes running at you (actual running, like a real person, and they can outrun you) when you're armed with nothing but a fork.
With that being said, the game is quite bloody and therefore not for everyone, it's multiplayer is not very good at the moment, only half the map is accessible at the moment and the game is rather janky and buggy (which is quite funny more often than not though).