Take a trip back to the Sayaniona's Lair and RuneScape gold follow all the way to the room where you'll find the Greater Sayaniona's. You will find an opening in the wall at the back of the room. You will find a small bedroom, much like one in a Player Owned House. You can access Dreamland by stepping out of the bed.

You'll be taken to Dreamland by clicking this option. You will find yourself on an island that is tiny, with just one dream tree and it is surrounded by darkness. You do however, find the book in your inventory My Life, like from the Lunar Diplomacy quest. Just read it to return to reality. You will receive 5 logs when you cut your dream tree five times. It's more difficult.

Next you must have Level 55 Magic to remove Dream Logs. You can make use of a Solarus Staff to degrade a dreamlog. The staff transforms into powder-like after this. You have 5 Sets of Eclipse Logs. You will find the Nightmare Logs you need by rub the dusty substance on your skin. Go through the book, then return through the crack and out the cave. (Require level 70 woodcutting in order to be able to use the Nightmare Log Process.

How to Get: To do this, you require a Solar Ore and Solar Bar. The Solar Ore can be obtained on the west side of Solar Isle, where you have access to the mining site. You can extract the sparkling rocks by going into the crater. You will receive 1 Solar Ore. Also bring an hammer. 

To make an Solar Bar, combine the furnace and solar ore. Make use of the Solar Bar on the anvil and click Smith Solar Staff. You will receive the Solar Staff, and buy OSRS gold then you have to use it. (Requires 70 Attack and 80 Magic to Wield)