Here is a tool that I have made probably a few times now, but a lot of them weren't so good when it came to the attempt I had made.

This one shows a lot more potential than all of the rest and I've made it from a cheap and decent quality source of material. A hammer I found on amazon was about 16 dollars and was a totally rectangular one at that. The faces were square and it made it very easy to forge out into a different tool.

This tool, is referred to as a hot cut chisel and it has a narrow blade for for making deep slices into hot steel and iron. There is a cold cut variety, but it has a much more broad chisel edge with a regular 60 degree angle.

This tool is meant to be struck with a hammer swung by another smith. Mine is on the smaller end and won't be used for such large work, so I can strike it with my own hand hammer instead.