Unfortunately, no. That's a story driven element. You can't get that sword until you beat the 8th dungeon.
Here's my best tip for the dark wasteland. Stop trying to fight things. Dodging is your best bet, especially against those lightning fast super leevers. Also, don't forget to check for bombables and hookshot spots. It's a bit of a maze at first, but when you get enough of your map filled out, finding the end is easy enough.
Thanks for this… I made it through the wasteland in the end to level 8.
Made a little progress since my last post.
Just killed the Patra 3, but cannot make the bridge appear as shown here…. http://postimg.org/image/inyb6d7u9/



