Homebrew Warlock Invocation: Familiar Weapon

[Mechalobster]

Familiar Weapon
Prerequisite: Hexblade Patron, Pact of the Chain feature

You can transform your familiar into a weapon that you have proficiency with as a bonus action. Your familiar remains in weapon form indefinitely until you hit 0 hit points or you use another bonus action to revert it to its familiar form. You can choose a different weapon every time you use this ability.

If one of your familiar's attacks has a secondary effect that requires an enemy to make a saving throw if the attack hits, you can apply that effect to any of your attacks that you make with your familiar weapon that hit. You can use your spell save DC in place of the familiar's DC for those effects.

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Just a little something that I think would be kind of cool. Not sure how balanced it is.

[JNAProductions]

What are some examples of extra familiar effects?

Because Imps have an extra 3d6 Poison damage on every attack.
Pseudodragon poisons for an entire HOUR, and can potentially knock them out for the same duration (especially if you're using a Spell Save DC rather than 11).

Seems far too good.