Dragonlord

A Dragonlord is a person (unknown as it yet if they could be male or female or both) that can kill a dragon. It is said that all of them were defended during the The Great Purge. It is hinted that in 2.13, Gaius knows of only one man that could be still be alive, the last of the Dragonlords.

Its is unknown of as yet if they could do magic. However, with no one with that title and the fact that they were defended during the The Great Purge this fact could be true.

Its is also rumored that the last Dragonlord, is Merlin's father.