This is how Thomas' Train-Prime Training and Airachnid discovers Discord's corruption powers in Battle of the Machine Robos.

[The next morning, Thomas arrives at the Autobot base and transforms into robot mode. He walks up to Optimus Prime]

Thomas: Hello, Optimus.

Optimus Prime: Hello, Thomas. Today, you will be learning the capabilities of a Train-Prime.

Thomas: Wow-wee, I hope I'm up for the task.

Optimus Prime: [chuckles] I'm pretty sure you are.

Thomas: Thanks, Optimus. Let's get to my Train-Prime training.

[Meanwhile, Twilight is telling the story of the Dazzlings to Discord and the Mini-Cons Jetstorm, Slipstream and Fixit]

Fixit: Wow. You're saying the Dazzlings are sirens, right Twilight?

Twilight Sparkle: Yes. They were banished from Equestria a long time ago.

Jetstorm: And those three girls are the same ones who tried to take over Cybertron.

Twilight Sparkle: I know. I remember Optimus telling me.

Ryan F-Freeman: Discord, how did you get your corruption powers?

Matau T. Monkey: Yeah. How did you get them?

Discord: Now I'll tell you Ryan and Matau. You see, I got my corruption powers from one of those spells that Star Swirl the Bearded once preformed.

Matau T. Monkey: What spell did Star Swirl used, Discord?

Discord: It was a hypnosis corruption spell.

Matau T. Monkey: (gets excited) Oh my gosh! That's awesome! I'll go tell Crash and the others.

[Discord and Ryan watched as Matau runs to tell Crash and the gang.]

Discord: Is your apprentice always this excited, Ryan?

Ryan F-Freeman: Matau is sometimes excited. I think he's a bit similar to Pinkie Pie.

[Nearby, Airachnid and the Sirens have overheard]

Airachnid: Did you hear that?

Sonata Dusk: Hear what?

Adagio Dazzle: I think that something about a spell.

Airachnid: Discord said he got his corruption powers from a hypnosis corruption spell that Star Swirl the Bearded used once.

Sonata Dusk: Star Swirl is the one who banished us from Equestria.

Aria Blaze: But how are we going to get that spell?

Airachnid: I think I know just the place. Follow me.

Sonata Dusk: Ok. Let's go.

[Airachnid leads the Sirens to the castle of the royal pony sisters]

Airachnid: Here we are, the Castle of the Two Royal Pony Sisters.

Adagio Dazzle: How are we going to find the spell in there?

Airachnid: [chuckles] Easy. [heads in and the Dazzlings follow her]

[They enter the library where Adagio finds a book with Star Swirl's spells in it]

Adagio Dazzle: I think I found it.

[Adagio gives the book to Airachnid.]

Airachnid: Thanks Adagio, now to find the page where that spell is.

[Airachnid finds the page with the hypnosis corruption spell on it]

Airachnid: Here it is, now for me to try this spell.

[Airachnid performs the spell and gets Discord's corruption powers]

Airachnid: Now all I need is someone to test my new powers on.

Aria Blaze: On who?

Sonata Dusk: Maybe you would test your powers on that red train friend of Thomas.

Airachnid: You know, that's not actually a bad idea.

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