I'd like to add for trolls, that if you want a good bit of the xp for them towards slayer, but not much for combat (99 untrimmed, perhaps?) it's a good idea to do this: First off, you need to have at least started Fremmnik Isles to the point where you enter the save to kill the queen (I think it's a queen?), and have finished the Giant dwarf quest. Take your cannon down to the trolls where the honor guards are attacking. Set it up, and as long as you hit even a 1, it's your kill. Also good for money making. And as it's multi combat area, it's good for cannon as it will still attack the others. Now, on some of them you'll only get half the xp, because the honor guards will finish them off, but others you'll finish off and get all the xp. Plus, you still get all the noted seaweed, all the rune kites, warhammers, and granite shields. Not much for one assignment, but if you're still using Vanakka/Chaeldar and getting a lot of them, you make a good bit of money in the long run.