[2022] I didn't know there were legendary amps. When did they make this change?

I'm the designer who made this change. It was done alongside the release of Heroic Escalation. At the time, I wanted to tune the balance of some of the most extreme amps, and Virulent Impact is the top of that list.

Virulent Impact is fun, no question, and I didn't want to take away from how powerful it was. I could've reduced its strength in a number of ways, but ultimately, I really like that Virulent Impact is always the best choice. I love the aspect of it where when you see it, you definitely want to take it. Where it defines and changes your run in a meaningful way when it shows up.

To fully fulfill that role, I bumped it up to Legendary, it's currently the only Legendary Amp but it deserves that status. It means that it shows up less often, but it also means I didn't have to reduce the power of it, and it can remain a dominant best pick when it shows up!

It's still Rare in Terra Escalation because it requires the investment of a Talent Point to show up at all.

Hope this helps clarify a bit!