In deep pony >>>> LORE <<<< In history of it's self brings me to this G3 the 7 castles.... this changes everything.... In G1 there use to be 6 Princess.

Princess Primrose, Princess Serena, Princess Sparkle, Princess Starbust, Princess Tiffany, Princess Royal Blue... They all have wands at the time.... In g3 Princess Rarity is the chosen one to make the rainbow... However they too have wands so that castle that was there must of been castle of rainbows known as castle of unicornia. Or some say that is not true.

Ok so we have twilight sparkle the friendship castle. We have Princess cadence the castle of family... Now in theory the true and pure castle for happiness has to be the caslte of the two sisters...

Rye snoot why do you say that??

let me get into detail on how it is or once was.... After celestia banish her sister to the moon she could never be happy and she regretted everything so dearly... so she made high society and made that her castle of happiness. She wanted to be happy for her sister to return... which makes it Canterlot the caslte of happiness... The g3 castle is the castle of kindness!!! and then we have Unicornia the castle of rainbows... Now the thing we haven't seen are the castle of music and the castle of laughter... we may never know in the deepest lore about the music castle and the laughter castle.... our high hopes is that we push hasbro to make these two castles and in theory they just might if we ask for it.