Choose two Ability scores to increase by +1

Instead of sleeping, Sentient weapons enter an inert state that lasts 4 hours, they are also immune to disease, and resistant to poison

As a sentient weapon you can influence your wielder either by force or persuasion. whatever choice you make the wielder has to make a charismas, intelligence, or wisdom saving throw with the DC being your level plus the corresponding modifier. The wielder must be touching you in order for you to influence it. If the attempt was to persuade and you succeed then you have control of the npc and they regard you as an ally and will be able to communicate with you, but can attempt to end the partnership whenever they want, requiring you to attempt to persuade them again if you want to maintain control. If your attempt to persuade fails then you will not be able to attempt again for 24hrs. If the attempt was to force them and you succeed then you gain control of the npc, however they will not be able to communicate, you will have control of their voice and all their actions, as they enter a trance state. This control cannot be broken unless with a remove curse spell, but a creature can make an insight check versus your deception check to realize that your wielder is being controlled by you. If your control is broken your wielder sees you an enemy. If you fail the attempt to force them then they see you as an enemy and you cannot attempt to force or persuade that npc again.  

You take on the racial traits of the npc that you control with the Enthrall or Enrapture racial trait. This does not include their ability score changes

You can cast the mage hand cantrip, and your ability to carry yourself is not effected by the spells weight limit, unless there are objects or creatures preventing your movement