These scripts typically exploit vulnerabilities in how Roblox handles data sent from the client to the server:
Arceus X is a popular third-party executor used to run custom scripts in Roblox games, particularly on mobile devices. While many scripts offer harmless gameplay tweaks, "Server Crasher" scripts are malicious tools designed to disrupt or shut down entire game servers, affecting every player present. How Server Crasher Scripts Work Arceus X FE Server Crasher Script
: Some crashers use the Roblox default chat service to spam millions of characters of data simultaneously. This causes a massive spike in ping, eventually freezing and crashing the server. eventually freezing and crashing the server.