Mind if I do my own take on Red Fel?

Spoiler: Red Fel, the Blade of Persuasion
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Red Fel, the Blade of Persuasion is an invisible +1 returning dagger. Against a creature unaware of the weapon you may make an attack with it as part of a Diplomacy check performed as a full round action or one a round if it is performed as a longer action, a DC 10 Sleight of Hand check allows you to disguise these attacks as simply exuberant gesticulation. When used as part of a Diplomacy check the Blade of Persuasion deals no damage, and cannot be felt by the target, but instead grants you a competence bonus to your Diplomacy check against any struck creature equal to 5 + 1/2 your Base Attack Bonus.

When wielding the Blade of Persuasion you gain a +5 bonus to feint checks against creatures unable to see or detect invisible creatures and objects.