Moldarach

Moldarach is a boss appearing in the Lanayru Mining Facility in Skyward Sword. It was first revealed at the 2010 E3 conference in a trailer for Skyward Sword.

Strategy
Moldarach will defend itself with its claws, but once it drops it guard to attack, Link must slash the eyes inside the claws in the opposite direction that the claws are guarding: if the claw opens vertically, Link must slash it horizontally. After slashing the eyes, one of them will turn red and Moldarach will then attempt to grab Link. The young hero can break free by shaking the Wii remote and nunchuck.

After hitting a claw enough times, it will fall off, and so Link must do the same for the remaining claw. Moldarach will now burrow under the sand and try to attack with its stinger by jabbing at Link, although this attack is easily avoidable with a backflip or a side jump. Link must blow away the sand covering the arachnid with the Gust Bellows to force it out of the ground. Its eye will turn red when it begins to charge its stinger attack, which is the Critical Point in which Link must stab the eye until it falls.

Trivia

 * Moldarach is an arthropod, like all the variations of the recurring boss Gohma in the Zelda series. Like Gohmas, its oversized, unnaturally-placed eyes are its weak points.
 * Moldarach's name seems to be a portmanteau of 'mold', which in the Zelda series tends to denote an enemy with a long or noteworthy tail (e.g. Moldorm, Twinmold) and 'arachnid'.
 * You have to face him again in the Shipyard Construction Bay as a Mini-Boss.