Phantomilians are residents that have been trapped. There is said to be a total of six Phantomilians to be found throughout each vision. Visions are technically the missions within the game. Getting them all will net you with the Hero of Phantomile trophy achievement (Save dreamers from their nightmares)
They are one of the many collectibles within the game and look like little musical note bubbles. Although some Phantomilians can also be found inside Ngapoko eggs
When you have successfully managed to find a Phantomilian the game will then indicate how many you have left to find. The game will indicate this by showing a small collectible picture.
This specific guide will help you locate all 6 Phantomilians located within Vision 4-2 (A Lull in the Wind)
PREVIOUS VISION: Vision 4-1
GUIDE: After carefully sliding down the hill we will then want to enter through the doorway at the end. Once inside the cave simply continue on to find this one.
GUIDE: Enjoy a ride down the water slide and the next Phantomilian will be residing at the end. Be ready to jump!
GUIDE: After riding the water slide we will come to an area with large boulders. Destroy the boulders using the enemy patrols. The next Phantomilian is here.
GUIDE: When you reach the skeleton spine there will be some platforms above us, make your way up them. At the top there will be an open doorway.
The Phantomilian can be found in here.
GUIDE: At the next skeleton spine make your way up to the right of the screen. Keep following the pressure up. At the top there will be a doorway for us to head through, do so. Here we will find our next one.
To get the Phantomilian we will have to ride the pressure up and then take advantage of the flying enemy nearby.
GUIDE: Head to the falling skeleton bones. The final collectible resides on one of these falling bones.
NEXT VISION: Vision 5-1