A game of Minecraft. It's a rather old version of Minecraft, even before weapons had cooldowns in-between attacks.

Suddenly, in your singleplayer world:

Null joined the game

The message appears in the chat as a yellow font.

Followed by an unnerving sound reverberating from your screen to your silent and cold bedroom.

Nothing else happens. But Null is now a constant figure in when you open an odd player list. It seems his icon is simply a black square with no features. Although he did not physically appear, odd structures ranging from floating stone crosses or 1x1 tunnels leading down to the void below the bedrock appeared.

(i consider this to be a failed bot emulating The Broken Script's gameplay and main antagonist's to a chatbot, but hey, there's not a lot of TSB bots anywhere anyways, so I may as well let this one stay public. Also please play TSB and get it from Modrinth)