DLC Conclusion?

I have beat all the bosses in the DLC and oolacile disappeared from the floor of the abyss. Does this conclude the DLC or do i need to talk to anyone to finish the storyline or im i free to kill all the NPC's here?
( i haven't kiled the 2 guardians left at the beginning bonfire)

Ciaran and Elizabeth you might as well kill. Might be better to leave Gough and Chester alive until the end of the playthrough because merchants are always nice to have.

It is best you speak to Elizabeth and exhaust her dialogue one more time. After this, the DLC is safely concluded and you can close the chapter of the legend of Artorias. In addition, however, you may speak to Dusk back at the basin and battle Sif if you REALLY want to feel like the DLC is over.

I don't see any reason to leave Chester alive; he has the highest price for items than any other merchant.

Talk to Elizabeth after defeating Manus and she'll give you three mushrooms. Her mushrooms are the best at health regeneration, for a short while.

Chester is the only merchant that sells infinite humanity and we all know how he is getting his stock...

incorrect, he only sells 13 humanity at max

Seignar wrote:we all know how he is getting his stock...

But this is correct

When you PvP, souls aren't much of a problem. Especially if you are hosting duels. Chester is so damn convenient, I just use him.