Which NPCs do we kill in order to finish a quest?

Question

As far as I know we have to kill Pythius The Rotten during Firewalker Boots quest. Are there any more NPC that we have to kill to finish the quest?

Comments

Zalamon for Wrath of the Emporer and Azerus for In Service of Yalahar
Honorable mention to Drume since he is in that room having a discussion with Kesar, but technically still a creature at that point.

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Hey Tigrokey you should post your comment into a answer.

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@Tigrokey - please post your comment as an answer, so I can select it! :)

Answer 1

The ones that I know of are:

Boss	Quest
Pythius the Rotten	The Hidden City of Beregar
Armenius	Blood Brothers
Zalamon	Wrath of the Emperor
The First Dragon	First Dragon Quest
Azerus	In Service of Yalahar
Planestrider	Opticording Sphere
Thaian	Feater of Souls

Other NPCs that can be killed 

• Armenius (There is only a chance you will face  during the Blood Brothers quest)
• Owin (Chance to be found when there is a full moon on Grimvale)

Comments

Azerus  From In Service of Yalahar Quest and Planstrider from Opticording Sphere Quest.

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Added these!

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Consider also Thaian ;X

Answer 2

Zalamon for Wrath of the Emporer

Azerus for In Service of Yalahar

Honorable mention to Drume since he is in that room having a discussion with Kesar, but technically still a creature at that point.