Desynthesis Endgame Guide

[Dreufo]

When I read the description for Demicrystal I was imagining:

- Acquire a high-level crafted weapon or weapon drop. Equip until spiritbond is 100%. Desynth with a 10% chance of obtaining Demicrystal.

If that's the case this will be a nightmare D:

The question is now, how high level does the weapon have to be to yield the crystal? What runs will be required to make a dent in the spiritbonding?

EDIT: If we're lucky it will just be like Demimateria of the Inferno etc. and it just comes from certain weapon and gear drops.