Final answer:
Breach's Aftershock (C) ability in Valorant costs 100 Credits. Players must purchase this during the pre-round buy phase, and the cost can change with game updates.
Step-by-step explanation:
The cost of Breach's Aftershock (C) ability in the game Valorant is 100 Credits. As a player, you need to ensure you have enough Credits to purchase this ability in the pre-round buy phase. It's a powerful piece of Breach's toolkit that can clear out fortified positions, so spending on it wisely can be a strategic move during a match. Remember that the price of abilities can change with game updates, so it's good to check the current cost in the game or patch notes.