NOTE: This question contains spoilers regarding Hoard of the Dragon Queen!
I'm about to finish up running a playthrough of Hoard of the Dragon Queen. One of my player's characters prefers greatswords, and I have a few questions regarding Hazirawn, the magical greatsword wielded by Rezmir, as the player will no doubt want to keep the weapon.
The full text for Hazirawn is as follows:
Weapon (greatsword), legendary (requires attunement)
A sentient (neutral evil) greatsword, Hazirawn is capable of speech in Common and Netherese. Even if you aren’t attuned to the sword, you gain a +1 bonus on attack rolls and damage rolls made with this weapon. If you are attuned to Hazirawn, you deal an extra 1d6 necrotic damage when you hit with the weapon.
Increased Potency. While you are attuned to this weapon, its bonus on attack rolls and damage rolls increases to +2, and a hit deals an extra 2d6 necrotic damage (instead of 1d6).
Spells. Hazirawn has 4 charges to cast spells. As long as the sword is attuned to you and you are holding it in your hand, you can cast detect magic (1 charge), detect evil and good (1 charge), or detect thoughts (2 charges). Each night at midnight, Hazirawn regains 1d4 expended charges.
Wounding. While you are attuned to the weapon, any creature that you hit with Hazirawn can’t regain hit points for 1 minute. The target can make a DC 15 Constitution saving throw at the end of each of its turns, ending this effect early on a success.
Okay, first question is how much additional necrotic damage actually gets applied if the person wielding the weapon is attuned to it? Because in the first paragraph it says 1d6, and then in the next paragraph (Improved Potency) it contradicts itself and says 2d6 instead of 1d6. How many d6's of necrotic damage actually get added on to the damage?
All of the charge-based magical items that allowed you to cast spells in the Starter Set contained a clause that would allow the item to be destroyed if all of the charges in the item were expended and you rolled a 1 on a d20. Hazirawn does not have such a clause. Does that mean you can repeatedly use all of Hazirawn's charges without risking its destruction?
When Hazirawn speaks, does it do so telepathically or is it just a disembodied voice? If it's the latter, would it be appropriate to assume that keeping the blade sheathed 'muffles' (for lack of a better term) the voice, allowing for some humorous instances in which the PC can end a conversation with the sword by angrily sheathing it in a hastily manner? I'm well aware that given the lack of specifics provided in the text I probably have carte blanche to really do whatever but I'm genuinely curious to see how others have handled this situation. Advice here need not fit this exact situation, but can instead be about the behavior of sentient magical weapons in general.