Spirit of Summer

Starting off
Start by going in to level 26 wilderness. The quickest way to reach the quest start point is to teleport to Clan Wars by Games necklace. Find the "abandoned farm" (marked as ruins on the world map). It is in between the Clan Wars and Bounty Hunter, just north of the Graveyard of Shadows. You will find a "spirit". Follow her untill she enters a house. Follow inside. You get a message that you are being pulled by a force and are asked if you want to follow it. Choose yes.

You see a man who traps the girl in a sort of rings. Equip the Ghostspeak amulet. Talk to the man. He doesn't answer. So, use the opposite emote that he uses (Yes with No, Bow with Angry, Shrug with Wave, and Cheer with Yes.). For each time doing the right emote, one of the rings around the girl nearby would disappear. After all the rings are gone, speak to the spirit girl. You will find her very hard to understand. Anyway, she wants to meet you at a village in the mountains to the west. Head to another ruins marked on the map in the westernmost part of the Wilderness, west of the Bandit Camp. Beware of Revenants.

Clean the spirit
Talk to the spirit again. She will again not talk properly and mention something like "being stuck", "a beast", "washing something" and "a barrel" (the one she is next to). For this part of the quest you need a rake, a bucket, a watering can, a hammer, 4 steel nails, 2 planks and a seed dibber. All items can be found at the ruins, but you can also go to Varrock and buy them.
 * The girl wants to clean her face. Next to her there is a barrel, which is filled with water in the real world. Empty the barrel in real world using a bucket on it. Now enter Spirit World again. The girl can wash herself now.
 * The girl now wants something to eat. Go back to the real world, west of the patch near the statue, and pick up the hollow log. Return and she will eat that.
 * The girl then wants you to get some clothes out of the wardrobe she is standing near. Back in the real world, use a plank on the wardrobe with another plank, 4 steel nails and the hammer in your inventory.  Go back to the ghost world and she will be able to use the rag to clean herself up.
 * Next, she wants to have her doll from the diseased Limpwurt plant you see. Once again, go back to the real world. Rake up the weeds, then search around for a limpwurt seed or bring your own. Plant and wait for it to grow (watering makes it faster), then go back to her world, where during the cutscene, she will get her doll.

Trapping the Spirit Beast
After this, she will begin to speak normally and ask you to go to the farm, she'll teleport you there if you decide to go immediately. You need to place offerings for the altar to feed off once she shows you where to go. Go back to the real world and pick up a skull and five bones, the bones are strewn around the farm and the skull is just to the east of the farm. Go back to the spirit world and use the skull and five bones with the altar, you will see a cutscene and the little girl will congratulate you on activating the disc and that you will now need to give it the power of a newly summoned soul. There will be three discs. Summon a Spirit wolf for the first disc, dismissing it as soon as both the beast and the familiar are on the disc. Do the same thing with the second disc, but with a desert wyrm. Then, summon and then quickly dismiss a Spirit Scorpion when the player, familiar and The Beast are all on the disc. If the scorpion is not dismissed when the Beast gets too close, it will devour the spirit, requiring you to get another Spirit Scorpion pouch, so several of the pouches are needed. After the Beast had three shocks, three spirits pop up and seal it at the last disc. Quest Complete!

Reward

 * A new realm for you to explore.
 * New areas for Combat and Woodcutting.
 * Access to Cursed Magic Trees.
 * 1 Quest point
 * 7,500 Construction exp
 * 5,000 Prayer exp
 * 2,000 Farming exp
 * 1,000 Summoning exp
 * Jennica's ring
 * If you ever lose your ring u can get a new one by searching the rubble where u start the quest

Extra Rewards

 * By operating the ring on the portal near the limpwurt root from the quest, 10,000 farming experience will be acquired. You must have at least 50 farming for this to work.
 * By operating the ring on the portal near the axe hut, 7,500 attack experience will be acquired.
 * By operating the ring on the portal in the graveyard of shadows, 10,000 prayer experience will be acquired.
 * There is a weak portal at the chaos tunnel. Operating the ring will have no effect there, as "the connection is too weak".

Music Unlocked

 * Shining Spirit
 * Troubled Spirit

Trivia

 * On the day of release, the spoilers said "Woo... wooo..."


 * On the day of release, Spirit of Summer was not yet on the quest list, but was added 10 minutes later.


 * The Spirit Beast in the quest is an astounding level 717, which surpasses TzTok-Jad as the highest level monster in RuneScape, though the Spirit Beast cannot be fought.


 * Surprisingly, seeing the spirits in the quest does not require the Ring of Visibility.


 * You can get a skull in the spirit world a little east of the farm.


 * After the quest was announced, and before it was released, when walking through the Ruins, you would get the message "Whoo... Whoo... Whooo!" in your chatbox. If wearing an Amulet of Ghostspeak, the message would be somewhat along the lines of "Help... Somebody, please!".


 * This was the first quest that needed a Summoning Level to complete.


 * A bug existed during the quest that would cause your character to still "have a familiar" after it had been dismissed. this was fixed by logging out and in.