Hello again, a few odds and ends.
For Evoker, Clearwell when equipped with Union or Ether Sprite does not appear to grant regeneration as the description claims, it just heals a bit. I never actually tried to use it with Ether Sprite, betting on the AOE regen, so it took until now to notice.
I promoted a Samurai to Elementalist, and they have since learned a number of Nail skills corresponding to each of their Samurai stance elements, except for Light. Waki stance is Lux element, but they learned no corresponding Lux element melee attack (as of EL-13). Not sure if this is a bug or not, but it broke the pattern so I figured I'd mention it.
The Nihil claws do seem to do percentage damage, but attack twice like other claws when the description says they attack only once.
The Undeter/Immove and Clarity/Unwaver shields seem to have their resistances swapped; when I check on the stats screen, Undeter and Immove improve Ether resistance by 10% while Clarity and Unwaver improve Physical by 10%.
Also I now have three copies of Changelin, not sure why it stopped at 3 instead of filling up my entire skill list, but I trust that whenever I get access to that thing you mentioned it will sort itself out.