ST Boon of the Spellsword

Your mastery of both martial prowess and arcane power has reached new heights, allowing you to seamlessly weave swordplay and spellcasting into a harmonious dance of battle. You gain the following benefits:

Ability Score Increase: Choose from any ability besides Constitution and raise this ability score by 1.

Bonded Weapon: Choose one melee weapon to bond with over the course of an 8-hour ritual. While bonded to you, this weapon does not require attunement and can be used as a spellcasting focus. The bond lasts until you complete the ritual with another weapon.

Arcane Enhancement: If your bonded weapon has an enhancement bonus, you may add that bonus to your spell attack rolls and the saving throw DCs of your spells. This bonus is capped at +3 and does not stack with other attunement bonuses to spell attack rolls or spell save DCs.

Spellsword: When you take the Attack action on your turn, you can replace any number of those attacks with casting a spell that has a casting time of 1 action. If the spell requires a saving throw, the target must make the save as normal. If the spell requires a spell attack roll, you can use your weapon's attack bonus in place of your spell attack bonus, and the attack is considered a melee weapon attack, not a spell attack.