The Cubical Incident was an problem that occurred from April 12th to April 14th of 2021, when multiple exploiters (mostly initiate conquerors) would amplify a leak within the World Conquest games allowing for a large cubical mass to form onto the map. It was a very difficult process to catch the exploiters for most of the time, but in the end it resulted in Trumpyboi122, the man behind the exploits, being permanently banned from the community.
The "cube" later turned out of actually be a filtered item from Roblox catalog, as confirmed by the Developer of World Conquest, BetterNotDie. (Quite literally says “hat” in the exploit logs lmao)

A screenshot of the exploit logs, showing user Trumpyboi122 spawning it within the map

The Cube as seen ingame
Behavior
The cube most of the time sits around and does nothing. However, it can sometimes attach to players if the exploiter is ingame, thus making it more difficult for the culprit to be caught and allowing for the person to leave. When staff would first get word of this, several users were banned in high suspicion due to being clinged onto the cube itself by the user controlling it.
If you go near the cube, depending on the device your on it can cause lag for most users and slowing down the frame-rate.
Reaction
When the Cube first spawned, players were easily confused. For brief periods of time there would be trolls comparing the cube to the Kaaba in Islam and making "cults" to begin pretending to worship it.

User being jailed by staff under suspicion of exploiting