Dueling Sword . It fits the samurai/magus flavor and has the best unique item support in Kingmaker.
Spend points to hit against the enemy’s Touch AC (ignoring physical armor). This is your "boss killer" button. Step 4: Essential Spells pathfinder kingmaker magus sword saint guide install
: Spend points from your Arcane Pool to add properties like "Bane" or "Keen" to your blade on the fly. Strategic Build Options Dueling Sword