there is an island not charted on the map that has a spring if you have ten power gems press a in front of the spring a voice will say wich gems do you have present select power if you have enough your power spirit will get powered up and you can equip him on the collection screen.this islan is on the bottem left on the screen and is in between three boulders and you cant see it on the map so you have to find it and then it will be charted on the map.hope this helps :>
Here is an extract from an IGN page.
Here is the link to the page: ign.com/wikis/the-legend-of-zelda-phantom-hourglass/Spirit_Gems
You can find them everywhere: in treasure chests, on the sea floor, there even sold to you
You Can't
If you mean a door with the wisdom sign on it then you need the wisdom fairy's power to open the door.
You can find more sand with Treasure Charts and by finishing the boss inside of a Temple.
You must travel into the fog and use the spirits' power to locate the ship and climb on to save Tetra.
try checking on the internet they have helpfull answers (if you type the right thing in they should give you what you need type in to Google d.s legend of Zelda phantom hour glass where to find all the power gems hope that helped.im at that part and i don't know how 2 do that.
you need to get 10 power gems then you go to sprit island and talk to the water thing and click on power.Then you goto colletions and tap the spirt of power and there you go!
you cannot get ten faries in Zelda phantom hourglass. you CAN get ten gems to power up your fairy though.
Leaf is a spirit of power in phantom hourglass
to get to the ghost ship first you must find all the faeries power, wisdom, and courage then you will have a confrontation with the ghost ship..,.. in the foggy area in the nw quadrant
This is an ability granted to you by Ceila during the Bellum battles. After Ceila gives you a Phantom Sphere, tap the hourglass icon on the Touch Screen, then draw the figure eight to stop time. While time is stopped, hit Bellum's eye repeatedly, preferably with the Spirit of Power active.
you tap on the hourglass symbol in the middle bottom of the screen then draw a hourglass in the middle of the screen without taking your stylus off. (you may have to try a few times before it works.)
you could hit them with your powered up sword, which includes 10 power gems, or kill them with phantom sword