I'm trying to make a simple spiked star shape. I want to move the vertices in the same direction that the faces are facing, which gets complicated when I have to move across all three axes. I doubt that I can do this without using some sort of specific orientation, and I don't know much about Blender.

In short, my problem is that I have no idea what I'm doing.

I've messed around with it for at least 6 hours and the closest that I've gotten to accuracy was being able to line up the direction of the protruding lines with the tip of the pentagon in a top-down, orthographic view.

[![example](https://i.stack.imgur.com/7hQ00.png)](https://i.stack.imgur.com/7hQ00.png)

[![my model](https://i.stack.imgur.com/6Gie9.png)](https://i.stack.imgur.com/6Gie9.png)

*The dodecahedron was made by chandlerklebs on sketchfab*