Just a note, you don't need any specific staff to autocast ancient spells now (one of the recent updates). You can use staff of water and save yourself the cost and space of water runes.
I have redirected my crystals today. First conversation I was offered to re-enchant them, and when this was done, I started another conversation, which had an option of adding new teleport location.
From Champions guild, you can take canoe to Edgeville, then use agility shortcut to The Grand Exchange, and run to the spirit tree. Also, I recommend you to unlock fruit tree patch in Lletya, and herb patch on top of Troll stronghold. If you decide to continue after 60, you will want those.
From what i know, exact spot is different for different people. Few months ago, i have seen 3 people doing this clue at the same time (me and 2 others), each had it at different spot.
You will have 1 spot taken by astral runes, so its 27 amulets per cast, and xp is for each amulet, 27 x 83 xp = 2241 xp. If you have only 1 amulet in inventory, you will get xp only for 1 amulet.
Rock hammer for gargoyles, crystal chimes for warped tortoises, and regularly. I come to the spot, drink potions, start hitting, then OK WTF!!?! Fail :thumbdown: