how to get rune scim? and other questions

Hey guys, I know hardly anybody plays on this server but im having a great time. I've got a few questions though.

1: What can I kill for a chance at a rune scim? It seems I can't access the waterfall dungeon (nothing interesting happens when I try to board the little raft) for fire giants and according to another post I saw, the fire giants in the deep wildy were all Doric's for some reason. Even though I'm not 40 attack yet, knowing what monster drops them would give me a huge motivation to go hunting!

2: I killed the jungle demon guy and it says I can now equip dragon scims. I also got the Monkey Greegree, but nothing happens when I press Hold. How do I get a dragon scim?

3: I got a half of key from a chaos druid, how rare is that? Like should I go killing more expecting the other half?

4: What are some good monsters I can kill for alchs, as I want a good cash stack.

Thanks guys! I'll add anything else I need to know to this thread. Appreciate you!

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3 more questions:

How do you guys get to barrows?

And how do I get full rune armour? Is there a shop for some of the items?

Also, what's the general drop rate for clues for hellhounds? like what would you guys estimate it to be