Mobs Spawn Locations

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Hi. After having a heck of a time trying to find mobs for certain quests, I figure it is best for the community to come up of a place where we could find the necessary mobs/bosses in a centralized manner. On top of the inputs I will be adding here, I would like to ask the rest of you to help and put your insights to better sustain the knowledge and ease the course of quest hunting of everyone.

I'll leave this part blank for now as I gather the information and inforgraphics needed. For the meantime, feel free to add whatever you seem fit for the discussion.

Have a good day!