Weapon Circle

This is a druid who stealthy aids their companions from a hidden form. This druid is able to transform themselves into a weapon. Able to cast spells while in the form of a weapon. Even allowing a companion to wield the druid itself.

Bonus Cantrip

When you choose this circle at 2nd level, you learn one warlock cantrip of your choice.

Weapon Shape

Starting at 2nd level, you can change your form into a weapon. Your equipment changes with you and seems to make details in the weapons form to match what you may be wearing. Your statistics change to match those of a weapon you have chosen to change into (Note you may only change into a weapon that is non magical). 

This form requires an action to change into. While in this form you may still cast spells and can communicate telepathically with anyone you choose. You do not need somatic components to use spells and when you use vocal components anyone within 30ft of you can hear a whisper of it within their mind. 

If you cast a spell that requires a weapon attack to complete it then you allow the person holding you to use their attack action to complete the casting. Since you're the one casting the spell they can still make use of their extra attack option if they have it.

Circle Spells

You gain an extra spells of your choice off of the warlock class list at levels 3rd, 5th, 7th, and 9th.
At 3rd level you gain a 1st and 2nd level spell. At 5th a 3rd level spell, 7th a 4th level spell, and at 9th a 5th level spell.

Animated

Starting at 6th level, while in your weapon shape you can levitate and move around at your normal form's base land speed. You can also make weapon attacks.

Magical

When you reach 10th level, when you use your action to change into a weapon you can chose to transform into any weapon of rare value or under. You must have had seen this weapon before and have clear knowledge of it's magical abilities.

Extra Attack

When you reach 14th level, If you are in your weapon form and choosing to be animated you can you the attack action to make two weapon attacks. If you are being wielded by another person you can use your reaction to give the person holding you an extra attack on their turn.