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 D tier in our Slay the Spire 2 card rankings.

Across 1058 recorded runs, decks running it win 14.4% of the time, right in line with the typical deck. It’s a more selective pick, turning up in just 5.1% of decks that could run it. Taken in 25.8% of its offers, it still trails on the pick-versus-skip split: 14.4% for runs that took it against 17.9% for runs that left it, a -3.5% pick lift over 889 decided runs. Silent players keep it in 0.3% 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 Fasten — together they post a +27.3% swing in win rate. It also has strong chemistry with the relic Sword of Jade, which moves its win rate by +32.1%. At 0 energy, it’s upgraded in 24.0% of runs and usually joins the deck around floor 12.

Upgraded, it gains +1 Damage, +1 Vulnerable, which is why so many decks invest a rest-site upgrade in it. That’s 151 wins, 894 deaths, and 13 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Kaiser Crab Boss, which closes out 6.1% 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.

Pick or Skip: Beam Cell

Out of 4136 recorded offers Beam Cell is taken 25.8% of the time, and taking it is worth -3.5% in pick lift — 14.4% for runs that picked it against 17.9% for runs that skipped, across 889 decided runs.

Taken 1066 times out of 4136 offers.

Pick rate when offered counts offers, not runs: out of every time the game put this in front of a player, how often it was taken. It is not the same number as the share of runs that end up containing it.

Pick lift is the sample-adjusted gap between runs that took the option and runs that passed on it. It is the fair way to rank choices, because raw win rates put the smallest samples on top.

When to Pick Up Beam Cell

Beam Cell is strongest when it joins the deck in Act 3, where runs win 48.3% across 61 runs — one of 4 recorded pickup windows.

Win rate of runs by the act Beam Cell entered the deck. Acts that have not reached the sample floor show their run count only.

Best Cards to Pair with Beam Cell

Ranked by win-rate lift, Beam Cell performs best alongside Fasten (+27.3%), Subroutine (+21.5%), and Mad Science (+21.3%).

Fasten+27.3%15 runsSubroutine+21.5%122 runsMad Science+21.3%64 runsPrepared+20.5%17 runsMachine Learning+18.4%110 runsNeow's Fury+18.2%22 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 Silent (42.9%) and Defect (13.4%) by win rate.

The Silent42.9%14 runsThe Defect13.4%1023 runs

Best Relics for Beam Cell

Beam Cell pairs best with the relics Sword of Jade (+32.1%), Jeweled Mask (+25.0%), and Forgotten Soul (+22.7%), ranked by win-rate lift.

Sword of Jade+32.1%21 runsJeweled Mask+25.0%19 runsForgotten Soul+22.7%37 runsJoss Paper+22.3%62 runsData Disk+22.3%93 runsLooming Fruit+21.9%16 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 24.0% of runs and usually picked up by floor 12.

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 Kaiser Crab Boss (6.1%), Knowledge Demon Boss (5.8%), and Aeonglass Boss (4.9%).

• Kaiser Crab Boss6.1% of runs
• Knowledge Demon Boss5.8% of runs
• Aeonglass Boss4.9% of runs
• The Insatiable Boss4.7% of runs
• Queen Boss4.3% of runs

See Also

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