Be it an act of desperation, spite or whatever reason the author who desides, just before their pendants shatter the sirens cast a spell that turns the Rainbooms (Princess Twilight Sparkle optional) into sirens.

7420641
i am certain someone has played with this idea before

7420846
Really? Because I can't find any.

7420851
I know for a fact there is fanart of this concept. So its very likely someone at some point did a fanfic for it.

7421138
I know about said fan art.

7420641

Be it an act of desperation, spite or whatever reason the author who desides, just before their pendants shatter the sirens cast a spell that turns the Rainbooms (Princess Twilight Sparkle optional) into sirens.

I'm assuming that's a transformation material idea, right? :3

7421349
Yep!

7421407
Awesome :3

Btw... got a link to the fan art of said concept? ^^

7421411
Here's one.

7421430
Noice. :3

7421432
Yep.

7421495
Heh =3