Walkthrough:The Legend of Zelda: Twilight Princess/Diachronos/Part 10

Summary
Thrall causes the extinction of the Twilit Parasites and restores Light to Lanayru Province. Then he goes around picking up more stuff than one person should ever be allowed to carry.

Twilit Parasite hunt #3
This is the biggest Parasite hunt in the game; it covers the majority of Lanayru Province.

When you leave Lanayru's spring you'll see a Twilit Parasite (or, rather, its electric charge) run up the bridge to the left. Don't follow him just yet; instead, go right and swim across the lake to find a Parasite hanging out near the waterfall. Total: 1/16

Head back to the Spring entrance and head along the bridge, then kill the Parasite running around here. Total: 2/16

Head over the next large patch of land to encounter another trio of Twilit Messengers; kill them for yet another Portal you can use. Then run along the wooden planks leading over to the floating house; the third Parasite is flying around behind it. Total: 3/16

Go back to the Portal you just created and look for a slope next to the wooden bridge leading to the spring. Follow it and jump across some gaps: one straight ahead, then one to the right, and finally one to the left. After the third gap, you should be able to go up a hill to find a Parasite hiding in some grass (he'll burrow underground if you're too slow). '''Total: 4/16. '''
 * Don't fall off the platforms, or you'll have to swim all the way back to Fyer's house and try again. Not fun.

With these four Parasites taken care of, head to the small island near Fyer's place and use the Hawk Grass to call that giant Twilit Kargarok; we need to get up the river, and he's exactly what we need to do that. Keep an eye on the mini-map for the four Parasites on the way up; as you approach some Parasites, activate your Senses and L-Target one, then use A to charge into it. You'll kill it and grab the Tear at the same time. Total:8/16

At Upper Zora's River, run over and check Iza's spirit (sitting on the steps) to make another Parasite pop out of the steps; kill it and run up the steps to cross the river. Total: 9/16

On a tall ledge overlooking the river is another Howling Stone; use it to cause the golden wolf to appear in West Hyrule Field. Listen to the Zoras nearby to hear about a waterway that leads to Hyrule Castle. Don't follow them just yet though; there's some more Parasites in Zora's Domain.
 * This time, the tune's the Requiem of Spirit from Ocarina of Time!

Head into Zora's Domain and deal with the two Parasites in the center of the pool of water (stand on the floating plant-things so you can attack), then head past the two rocks jutting out of the water on the east side and follow the ramp to another one buried in the ground. Total: 12/16

head to the west side of the pool and use M-jumps to make your way up the waterfall. Keep an eye out for a trail of Rupees; when you find it, follow it and jump across to a ledge. Follow the ledge to another Parasite. Total: 13/16

Now warp to the top of the Domain and ram the southeast wall to knock another one down. Total: 14/16

Finally we can go get the Tear in Castle Town. Leave Zora's Domain and follow the river until it splits; take the branch to the right to end up back in North Hyrule Field. Head for the western entrance, where you're stopped by another trio of Messengers. Deal with them to create a much-needed Portal, then go into town and grab the Tear next to Telma's Bar. If you killed the Parasite the first time you came here, the Tear should just be floating around in the alley. Total: 15/16

That's all of the Parasites marked on the map, but... we're still missing one? Lo and behold, the missing Parasite appears out of nowhere back at Lake Hylia! Warp over there and swim out to some floating debris in the water.

Twilit Bloat
Say what you will about Bloat; I think he looks cool.

A huge ball of electricity floats up out of the water, but there's nothing else... Turn on your Senses to see the biggest, nastiest Parasite ever.

Bloat will fly around a bit before trying to ram you; when he attacks, jump to the side and pounce on him, then hammer the A button until he shakes you off. You'll need to do this three times to move on. Fortunately, there's crates with Hearts on the debris in case you get hit (unfortunately, Bloat seems to enjoy breaking them as he's flying around...).

After three bite sessions, Bloat will just float on his back in the water and play dead. Jump onto his stomach and charge an area attack, then let it loose to hit all six of the orange bulbs sticking out of him.

Bloat's defeated, and he leaves behind the final Tear of Light (we should at least get a huge Tear for that...); grab it to return the Light and initiate an annoying cutscene where Lanayru (in the form of a giant snake) tells you the history of the Fused Shadows.