A Blueprint Function Library is a collection of Functions that you can call from anywhere within the project, this makes it ideal to avoid non-stop “Cast To” something in order to access certain Functions or Variables, simply do it once inside the Blueprint Library, call it from anywhere you want.
To expand the FPS Game Starter Kit with additional nodes, I made a Blueprint Function Library that contains several handy nodes to make it easier to access few of the most commonly used Functions and Variables without the need to “Cast To” anything.
Previously this was a DLC add-on, however due to its popularity it has been integrated into the kit several versions ago.
A lot more custom nodes have also been added:
FPS Game Starter Kit 