So you know those cards that come with almost every figure in the PotP line? The ones that describes what powers a certain character gets depending on which prime master they merge with?
Well there's a tfwiki page that has all of them listed, and I decided to read through them.
They're all pretty standard. Some are a bit more interesting than others, but all in all they're so so. With one exception. That being Slug and Megatronus.
When Slug merges with Megatronus with his prime armor, he gains the ability to, and I quote "Erases enemies from existence." He can just look at you, say "I don't like you" and then poof. You are completely eliminated from all of existence. And given that this is Slag we're talking about, that's gonna be a lot of people.