The Legend Sword
Christopher walked into the depths of the Island at an unhurried pace. Behind his mask, his expression was one of contemplation.
'This Legend Sword is a lot more important than I'd previously thought. I knew it was important from the get go, after all, what sort of relic required those from the most powerful races to come to a mutual agreement to protect them? Still, it's crazy.' He thought to himself.
Pretty much what had happened was that, after Christopher had gotten the information from the Voidwalker and killed him, he spent some time unraveling the barrier that surrounded the entire Island so that he could teleport his people. And at the same time, he got information from the people there about the Legend Sword and its importance.
It went like this.
Years ago, there was an unbelievably powerful existential threat that appeared from outside their world. Not the Void, but something equally harrowing.