yes you can also other things like mithril rune med helm and others dont know exactly
Obtained as a drop from Commander Zilyana in the Saradomin Encampment of the God Wars Dungeon.
Monsters in the god wars dungeon drop them. They're really hard to beat though.
Two things: Soul Split (The prayer) Saradomin Sword (The drop from the godwars saradomin boss)
I assume that you are talking about "black nights" They drop bones, various runes, seeds(members only), and various charms for summining(members only) They also drop equiptment: Iron sword, iron full helm, steel mace, black full helm, mithril arrows, black 2h sword, black sword.
Killing bosses at Godwars Dungeon they drop parts of the blades, of which if you have a good smithing level, you can combine to makes a full godsword.
If you mean the blurite sword, before you complete the quest, drop the sword, and give the dwarf more ores to make a sword. he will make you one, and then you pick up the other sword you dropped. you can do this as many times as you like, but it is not worth doing because it is weaker than a bronze dagger, and is untradeable. i hope this answers your question.
The most expensive drop you can get on runescape is the corrupt dragon battleaxe at 3.9m
bones
They will attack you, and they can drop loot. see this page: http://www.tip.it/runescape/index.php?rs2monster_id=238
No.
hill giants and hobgoblins drop them sometimes
Right click the rocks and say "drop".