Being a variety of giant tortoise spending its infant stage quietly beneath soil, only to emerge upon maturity. It is a quality of the giant tortoises that, depending on how deep down in the earth their youth was spent, the composition of their shell, and thus the particular species to which they belong, comes to differ. Of their ilk, the silicon tortoise has spent its youth in the deepest of tenable places, being born with a thick layer of fat inside its shell so as to sustain its growth without the need to eat.
Armor, once sundered, requires Repair, and that costing more dearly when such is of High Quality. Why? Fool! You must use Materials of like Strength lest all Assays at Repair be entered into vainly. Nor is the Procurement of such a mean Task. Stories abound of hale Warriors venturing forth to obtain Shells tough as Iron and ne'er returning, having run afoul of said Shell's Occupant.
An easy way to defeat the Silicon Tortoise at lower levels is to obtain a gun with an Attack power of 30 or higher, and some Wyrmfire Shot. The player should inflict the Oil status on the tortoise and have the character equipped with the aforementioned ammo. The player should be able to take 6,000+ hit points per shot. If Berserk is on said character, they can attack for a full 9,999 HP per shot if they are around level 20.