Final answer:
Breach's Fault Line (E) ability in Valorant is free of charge and does not require in-game currency to use, though it is subject to a cooldown period after each use.
Step-by-step explanation:
The cost of Breach's Fault Line (E) ability in the game Valorant is free. Fault Line is one of Breach's basic abilities, and it does not require the player to purchase it before each round, unlike other purchasable abilities or items in the game.
It is important to note that while Fault Line is free, there are abilities and weapons in Valorant that players must purchase with in-game currency earned during matches. Fault Line is on a cooldown, which means after using it, players need to wait for a set period before they can use it again.