Walkthrough:The Legend of Zelda: Twilight Princess/Diachronos/Part 9

Summary
Thrall learns where to go next, and spends most of this part of the walkthrough screwing around and looking for stuff. He advances the plot a little bit, but not much.

What are we gonna do with all this money?
Once again, Midna's portal sends us a long way: we're all the way back at Eldin's spring! He tells us where to go next, and- blah, blah, blah I wasn't paying attention. To the sidequests!

It's good to have money
Run on over to Barnes' Bomb Shop. Notice how there's a bunch of Gorons around town right now; they feel bad about not helping Kakariko when they were in trouble, so they're doing everything they can to help out now. Yep, now that they don't NEED any help they're getting it...

Run into the shop; now that Barnes can get supplies, he can make more Bombs. Talk to him; he notices that we don't have a Bomb Bag, so he offers to sell us one for 120 Rupees. And it even comes with 30 Bombs! Buy it! You can't get further without Bombs.
 * Barnes says he'll send a letter telling us how to make Bomb Arrows, but I'll tell you now: Equip the Bow, highlight your Bombs on the Item menu, and press R.
 * Wait, he said he'd send a letter... that means... oh, hell no...

Now we can blow stuff up, which is always fun. Run back to the spring and bomb the nearby boulder; head into the cave behind it and keep going until you come to a ledge overlooking a pool of water. Dive in and put on the Iron Boots, then open the chest at the bottom for our next Piece of Heart!  Piece of Heart Total: 9/45 . Quickly take the Boots off and surface before you drown! Swim to a ledge you can climb onto; turns out this is behind Eldin's spring.

Run back to the boulder and make some Bomb Arrows. Aim above the cave and blow up the cluster of rocks to reveal another Piece of Heart! Snag it with the Boomerang and enjoy you new Heart Container!  Piece of Heart Total: 10/45   Heart Container Total: 7/20