Yes, I did save him, got me a nice neclace

I am level 21 now. Did as adviced and went to do some other stuff. really having a good time.
I defeated the succubus in the hall of the Council of Seven and found it really hard. It involved shooting arrows, running away, stealth (survivor), repeat until dead. Actually, there were more fights I was only able to survive by using this tactic. It seems harder than it's supposed to be.
I still constantly have the feeling I am underleveled even though I try to solve all quests I encounter. By now I can kill most stuff without effort in the main area. However, I decided to do some more exploring before gathering the council members and went to explore the Dark Forest since there is a lot of new stuff to do there.
Now, I find that the animals there are around lvl 27-30. Does this mean I am still too low level for this area, or is this normal?
Also, I am still confused about the strength and agility stat. STR adds to melee damage and AGI adds to accuracy. This means that there is no way to get extra ranged damage trough stats, only extra accuracy?