This guide contains MINOR SPOILERS for the campaign mode. If you want to find these on your own, here are the clues Nicholas gives you during his boss fight:

"One submerged where the dead lie."

"One where bush & beasts intertwine"

"The last of the trio, 'neath my watchful eye is found in this castle, location awry"


But if you need help finding them look no further. I will tell you where they all are in this guide. If you have any questions let me know.

Location: Father Gregory boss fight

After catching up to Gregory, the shard for this level can be found in a corner left of the fog wall in the arena. Drive into the shard and use it like an item. Make sure to not let Gregory take it because it will NOT respawn unless you die or restart the level.

Location: Forbidden Forest Arena

This one is found close to where you start. To get it, drive forward on to the bridge and turn around before you get to the jump pad. You should be able to land in the area where the shard is on the right.

Location: Nicholas boss fight

During the second chase with Nicholas, he will step into a portal. Turn around and drive on to a walkway to the right of the railing. This will lead to a secret room where you will find the 3rd and final moon shard.

Once you've collected all 3 shards, play through the game as normal and reject the dolls offer. You will now enter the secret Miralodia boss fight. Hope this helped :)