@Dreamsicle  
the edges and the ornaments probably wouldn’t survive the first battle, but the core looks pretty solid. It probably would end looking like zaraki kenpachi katana

@Dreamsicle  
I could see it slicing open your hand when trying to use it too. That grip looks so smooth, and the hilt looks like it could be really sharp, and pointing straight at your hands.

I couldn’t see this being used for anything but an ornamental piece. Just seems like it would shatter after one good swing.

@That One Guy  
Well sure, I guess, but then that’d mean… that… waaait.  
…
 
O__O
 
You just gave me an idea that could solve my problem!  
zooms off to go write

@CogWeaver
 
Interesting…. sounds better than what I had in mind…

meh, more or less like an mlp version of  

I watched enogh power rangers to know that is a megazord sword.  
show me the megazord

@Cyborg_pony  
Aquarion the super robot.

@CogWeaver  
Actually, that’s still plausible.  
The Tree of Harmony could be like a ‘Sword in the Stone’ type of thing. And the stones form are another of the forms you mentioned, maybe dormant form, or battery form.

This reminds me of an idea I had for a while that the elements had different forms to them, where they could turn into weapons, full body armor, or even little sentient ‘guides’ that assisted the bearers in whatever they’d need. The idea also centered around the notion that Celestia’s and Luna’s necklace/crowns were elements of their own set to an ‘armor’ type mode, though of a higher ring of elements than the mane 6’s.
 
’Course, the show took a different turn, so I had to put that idea on a backburner, maybe for other uses one day.

@RIG  
Aquarion the anime or …?

Aquarion would be appropriate for this sword.

Behold, the Blade of Harmony….
 
I’ll bet something like this sees a lot of use in fanfiction….