This how The Overlord drains Twilight's friends of their magic goes in My Little Pony Transformers Prime: Twilight's Kingdom.
[The Overlord walks over to Twilight's friends]
The Overlord: At last. Your magic is mine!
Rainbow Dash: I don't think so.
Pinkie Pie: Good luck with trying to get it.
Rarity: We like to see you try.
Applejack: So why do you try?
Fluttershy: Is now the best time to let him?
The Overlord: Indeed it is.
[The Overlord uses his four arms to hold Twilight's friends in place and sucks out their magic with them and transforms into his fourth and final form: a giant dark purple dragon with purple eyes]
The Overlord: You really think Twilight would do anything for you?
[Discord comes over]
Discord: If Twilight has magic to give, it will be yours. Soon there won't be a Pegasus, Earth Pony, or Unicorn who will be able to stand up against us.
The Overlord: Us? Who said anything about us?
Discord: You did.
The Overlord: You've helped me grow strong, you've provided the means by which I can obtain Princess Twilight's magic and now you are no longer of any use to me.
[The Overlord grabs him and drains his magic]
The Overlord: Lloyd Garmadon who defeated me. You're as worthless as he is. [leaves to find Twilight]
[Discord falls to the floor]
Applejack: Surely you saw that coming.
Discord: I did.