4Chrono Lock
Stops the opponent's energy from regenerating.
Energy4
Duration8 s
TargetsRival
Max level8
How it plays
Your rival's energy bar stops refilling, so they cannot afford new cards.
Tip: Play it right after they spend energy.
Counters & answers
Where to get it
| Chest | Copies | Chance per card roll* |
|---|---|---|
 Gold chest | ×1 | 1% |
 Magic chest | ×2 | 8% |
* Before the ×2 weight for cards you do not own yet.
Also sold as single copies in the daily shop when offered: 800 coins per epic copy.
Levels
Upgrading only lowers the energy cost (4% per level, rounded, never below 1). Duration and strength are the same at every level, and each arena caps the level cards play at.
| Level | Energy cost | Copies to reach | Coins to reach |
|---|---|---|---|
| Level 1 | 4 | Unlock | — |
| Level 2 | 4 | 2 | 50 |
| Level 3 | 4 | 4 | 100 |
| Level 4 | 4 | 10 | 250 |
| Level 5 | 3 | 20 | 500 |
| Level 6 | 3 | 50 | 1,000 |
| Level 7 | 3 | 100 | 2,000 |
| Level 8 | 3 | 200 | 5,000 |