Hello,

As the title suggest, I'm wondering how Ninja's trait work. Does it convert MDEF to Evasion with 1:1 ratio or is there calculation to it?

Thank you.

Edit: I'd also like to know whether Spellsword and/or Arcane Blade use ATK or MATK if I was to use basic attack with the Spellsword's trait active.

You can check the stat bonuses in character info tab. Iirc it's 1 to 4

Basic attack uses ATK stat unless specified otherwise.