Moldarach

Moldarach also known as the Thousand-Year Arachnid is as its title suggest a thousand years old Aracha. They serves as the the boss of Lanayru Mining Facility and as the mini bosse of the Lanayru Shipyard in The Legend of Zelda: Skyward Sword.

Battle
Link first battles a Moldarach in the Lanayru Mining Facility. As Link enters the dungeon's boss room, the Moldarach springs out of the sand filling the room, and attacks.

Moldarach will defend itself with its claws, but once it drops its guard to attack, Link must slash the eyes inside the claws in the opposite direction that the claws are guarding. After slashing the eyes, one of them will turn red and Moldarach will then attempt to grab Link. The Slingshot is helpful during this phase of the battle, as its pellets stun the eyes temporarily so Link can proceed to inflict damage to them.

After hitting a claw enough times, it will fall off, and Link must then do the same for the remaining claw. Moldarach will then burrow under the sand and try to attack with its stinger by jabbing it 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 his weak point that must be attacked until the creature is defeated. The other Moldarach fought in the Lanayru Shipyard require the exact same strategy.

Fi's comment
"An Aracha that has survived its very lengthy larval stage is known as a "Thousand-Year Arachnid," which is precisely what you see before you. Over 90% of its body is shielded by a tough, chitinous armor that can deflect even the sharpest blade. The weak points are its overdeveloped pincers, but you must hit each at the right angle relative to the pincer's position to be effective. This beast has a tendency to bury itself in the sand when it feels its health is endangered. When it is burrowed below the sand, you can expect at least an 85% chance that it will attempt to stab you with its tail. I highly recommend removing the creature's environmental advantage by blowing away sand, thereby revealing its position.

Analysis reveals that the creature's central eye will be vulnerable to attack once its pincers have been properly disposed of. I calculate a near 100% chance that an assault on this weak point will ultimately prove quite fatal.

However, I infer from the armor surrounding the central eye that horizontal, vertical, and diagonal slashes will be entirely ineffective."