Flak Cannon•Attack

Is Flak Cannon good in Slay the Spire 2?

Flak Cannon is a rare Defect attack in Slay the Spire 2. In combat it resolves as: Exhaust ALL your Status cards. Deal 8 damage to a random enemy for each card Exhausted. It ranks among the strongest cards its class can draft right now, earning a spot at B tier in our Slay the Spire 2 card tier list.

Across 4 recorded runs, decks running it win 33.3% of the time, comfortably clear of the 12.6% average, by 20.7%. It’s a more selective pick, turning up in just 0.8% of decks that could run it. Defect players keep it in 14.3% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.5 times in the decks that take it.

It performs best next to Defend — together they post a -33.3% swing in win rate. It also has strong chemistry with the relic Cracked Core, which moves its win rate by 0.0%. At 2 energy, it’s upgraded in 0.0% of runs and usually joins the deck around floor 5.

Upgraded, it gains +3 Damage, which is why so many decks invest a rest-site upgrade in it. That’s 1 wins, 2 deaths, and 1 abandoned runs with it in the deck. Read on for Flak Cannon’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Defect run.

Best Cards to Pair with Flak Cannon

Ranked by win-rate lift, Flak Cannon performs best alongside Defend (-33.3%), Dualcast (-33.3%), and Strike (-33.3%).

Defend-33.3%3 runsDualcast-33.3%3 runsStrike-33.3%3 runsZap-33.3%3 runs

Based on small co-occurring samples — treat these as early signals, not final verdicts.

Flak Cannon Win Rate by Class

Flak Cannon is drafted only by the Defect, where it holds a 33.3% win rate across 4 runs.

The Defectappears in 14.3% of its runs (4 tracked)

Best Relics for Flak Cannon

Flak Cannon pairs best with the relics Cracked Core (0.0%), ranked by win-rate lift.

Cracked Core0.0%4 runs

Based on small co-occurring samples — treat these as early signals, not final verdicts.

Flak Cannon Card Details

Flak Cannon is a rare attack costing 2 energy; it’s upgraded in 0.0% of runs and usually picked up by floor 5.

Exhaust ALL your Status cards. Deal 8 damage to a random enemy for each card Exhausted.

Upgrade: +3 Damage

See Also

Compare Flak Cannon with the rest of the best Slay the Spire 2 cards, relics, and classes below.