1. Pure Roshen
Roshen is elemental glass. The roshen is translucent green, a big lump of glass that can be reshaped easily. There is enough to be made into a thin layer of skin over the entire mechanical body or a thick layer for one limb or the torso.

Power 22 elemental magic

If made into a skin, translates into +12/+12 armor if thick and +10/+10 if thin, and power 22 resistance against industrial magic or pollution (infernal poisons, pollution, industrial, destruction, rust, famine and drought, certain disaster magicks, and more)

Depending on shaping and effect, may also apply reflective power, pass-thru to certain attacks, distorting energy attacks, dispersing energy attacks, cooling or heating, etc. The ratings on these depend on what Antikytheria tries to do, so this one is kinda up to you.

2. Fey Name
A piece of fine vellum with the True Name of a fairy on it.

Power 25 glamour, one-time use

If used in a kamatuuran construct, can give the construct fey powers including glamour, illusion, dream sensing, magical rhymes, simple cantrips, etc. This includes using it on the 46.

3. Ueyi Kuauitl Seed
Ueyi kuauitl trees exist throughout the universe and protect it from being altered to an alternate reality. The seed can be used to grow such a tree.

If used in True Name rituals, it is an unaligned source of energy, meaning it will take on the alignment (celestial, elemental, fey, infernal, or unaligned) of the construct (the 46 is celestial, Antikytheria is unaligned) it is put into.

It's basically a 25-power source of raw True Name magic that can be used to do almost anything.