reduce fast attack time lad first two stars

[Black death]

Hello friends, how was the time in rapid attack reduced for the first two stars, where is this improvement and if it is in the museum, what is the artifact?

 

[King Crimson]

This is in the library.

 

[Walker]

Lol this is available in the gunpowder age.

 

[SomeRandomPlayer]

In addition, the Leonidas Bust war legendary offers +15% Quick Victory Time; but it's rather expensive.