Thames & Kosmos is currently working on translating a lot of extra content for Legends of Andor, but this particular legend is not done yet (although it’s top of the list due to the reference to it in the manual).
That said, the above link is a good translation.
This is exciting. I'd love to see some of the legends that make use of more than 1 board translated! Would feel like a pretty epic game to play over all 3 boards...