[Akame]

Being destiny'd means that any other classes you have unlocked outside of the class faction you have now dedicated your character to are locked. In doing so, Destiny Spellthief's copy-spells and the Tarnada are made useless. Spellthief's destiny copy spells, as well as the Tarnada's Vydel, are reduced to Rank 0 just because of the sole fact that mage classes are inaccessible.

Also, each time a new spell is released via new class, if a destiny Spellthief finds it desirable, they have to un-destiny with a Legend Extension, level up the new spell's rank from the new class, then re-destiny with another Legend Extension. This.. Ends up being a bit much and unnecessary. It can have an easy fix.

Simple solutions:

Copy Spells Rank are based off of the passive innate 'Overload Copy' skill or the 'Spell Snatch' skill instead of their ranks in the mage classes.
A Tarnada's Vydel rank is based off of ((UL/4)-1) with a minimum rank of 1.