Fantastic Guide! Though I would like to add an addendum to Spirit Warrior and even personally suggest considering it a little more worth while. Your Guide says that you can not use a shield and must one hand the weapon, but there are no actual restrictions implying that you must have a free hand. It says "You're wielding a one-handed melee weapon or a melee weapon with the agile or finesse trait;" which means that Sword and board Guardians get a lot of value out of Overwhelming Combination.
Additionally, Kaiju Defense Oath may make it Blue for small ancestries like say a Dragonscaled Kobold if your BBEG or Boss is size large. More damage is more damage after all
