Cha to Attack is hard. If you take levels in Sacred Exorcist, you could take Divine Might? Or you could just use this!
Soundmetal
Soundmetal is a brightly shining silver metal that is completely useless to the average person. However, bards and their ilk are not average people!
Effect
Anyone wielding a soundmetal weapon that has a charisma score above 18 may add their charisma modifier to their attack. In addition, anyone with the bardic music class feature can choose to expend a use of bardic music as a free action in order to gain their charisma modifier to damage for the rest of the round.
Armor forged from soundmetal provides no benefit to defense. It does, however, cause an amplify effect whenever the wearer is performing any kind of music.
Type of Item Item Cost Modifier Ammunition +90 gp Light Armor +7,500 gp Medium Armor +15,000 gp Heavy Armor +22,500 gp Shield +3,500 gp Weapon +4,500 gp