Beam Cell•Attack

Is Beam Cell good in Slay the Spire 2?

Beam Cell is a common Defect attack in Slay the Spire 2. In combat it resolves as: Deal 3 damage. Apply 1 Vulnerable. It currently underperforms most alternatives, sitting at F tier in our Slay the Spire 2 card rankings.

Across 161 recorded runs, decks running it win 15.3% of the time, trailing the 18.9% average by 3.6%. It’s a more selective pick, turning up in just 4.3% of decks that could run it. Defect players keep it in 27.4% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.3 times in the decks that take it.

It performs best next to Machine Learning — together they post a +19.1% swing in win rate. It also has strong chemistry with the relic Astrolabe, which moves its win rate by +19.3%. At 0 energy, it’s upgraded in 23.9% of runs and usually joins the deck around floor 11.

Upgraded, it gains +1 Damage, +1 Vulnerable, which is why so many decks invest a rest-site upgrade in it. That’s 23 wins, 127 deaths, and 11 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Knowledge Demon Boss, which closes out 10.6% of its appearances. Read on for Beam Cell’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Defect run.

Best Cards to Pair with Beam Cell

Ranked by win-rate lift, Beam Cell performs best alongside Machine Learning (+19.1%), Ice Lance (+17.3%), and Neow's Fury (+17.2%).

Machine Learning+19.1%10 runsIce Lance+17.3%11 runsNeow's Fury+17.2%7 runsSubroutine+16.4%22 runsDecay+14.9%5 runsFasten+14.1%3 runs

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

Beam Cell Win Rate by Class

Beam Cell is played across 2 classes, led by Defect (15.4%) and Silent (0.0%) by win rate.

The Defect15.4%160 runsThe Silent0.0%1 runs

Best Relics for Beam Cell

Beam Cell pairs best with the relics Astrolabe (+19.3%), Blood Vial (+17.5%), and Neow's Torment (+17.2%), ranked by win-rate lift.

Astrolabe+19.3%6 runsBlood Vial+17.5%19 runsNeow's Torment+17.2%7 runsRoyal Stamp+17.1%4 runsHappy Flower???+17.1%4 runsLizard Tail+15.4%8 runs

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

Beam Cell Card Details

Beam Cell is a common attack costing 0 energy; it’s upgraded in 23.9% of runs and usually picked up by floor 11.

Deal 3 damage. Apply 1 Vulnerable.

Upgrade: +1 Damage, +1 Vulnerable

What Ends Runs with Beam Cell

Beam Cell’s most common run-enders are Knowledge Demon Boss (10.6%), Queen Boss (9.3%), and The Kin Boss (4.3%).

• Knowledge Demon Boss10.6% of runs
• Queen Boss9.3% of runs
• The Kin Boss4.3% of runs
• Test Subject Boss4.3% of runs
• Kaiser Crab Boss3.7% of runs

See Also

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