A DLL (Dynamic Link Library) injector is a tool that allows you to inject custom DLL files into a running process, in this case, Fortnite. This can be used to modify the game's behavior, add custom features, or bypass certain restrictions.

I must emphasize that creating or using a DLL injector for Fortnite or any other game may violate the game's terms of service and could potentially lead to account bans or other penalties. This guide is for educational purposes only.