Arelith

Given these skills are core to the idea of the class and deity in question this makes sense to me.

Additionally it allows shadow sorcerers to take the popular blackguard dip without forgoing hide and move silently or nerfing their caster level into the floor.

Definitely thematic for the class.

Approved.

Not possible due to skill selections being assigned in the hak file.

Possible Workaround:
Multiply hard ranks by 2.
Risk:
Multiclassing becomes 66.
Levelling multiplies it twice on finishing level up if not stripped first.