What is African blade the Zulu iklwa as featured on Forged in Fire: Cutting Deeper?

This week on Forged in Fire: Cutting Deeper, the final two have to forge the African blade known as the Zulu iklwa. First up on this episode the contestants need to create their signature weapons, whilst the new bladesmiths are tasked with forging some bayonets that will attach to a rifle. But the main event