Additional Arms & Armor Attunements
The one wielded cuts a path to a lord's greater glory.
Using a Higher Level Spell
Increasing the Attune Arms & Armor spell's level can grant additional bonuses. For every 2-level increase, one modifier can increase by 1, whether +1 to hit or damage certain foes with a weapon, or +1 to AC or saves against certain foes via armor.
For example, casting Attune Arms & Armor as a 5th level spell to make an angel sword could grant a +2 to hit and +1 to damage the evil and disorderly, +2 to both as a 7th level spell, or even +2 to hit and +3 to damage as a 9th level spell.