Shadow Shield•Skill

Is Shadow Shield good in Slay the Spire 2?

Shadow Shield is an uncommon Defect skill in Slay the Spire 2. In combat it resolves as: Gain 11 Block. Channel 1 Dark. It currently underperforms most alternatives, sitting at D tier in our Slay the Spire 2 card rankings.

Across 59 recorded runs, decks running it win 23.1% of the time, comfortably clear of the 18.9% average, by 4.1%. It’s a more selective pick, turning up in just 1.6% of decks that could run it. Defect players keep it in 10.1% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.1 times in the decks that take it.

It performs best next to Overclock — together they post a +25.8% swing in win rate. It also has strong chemistry with the relic Bag of Marbles, which moves its win rate by +28.5%. At 2 energy, it’s upgraded in 23.4% of runs and usually joins the deck around floor 16.

Upgraded, it gains +4 Block, which is why so many decks invest a rest-site upgrade in it. That’s 12 wins, 40 deaths, and 7 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Queen Boss, which closes out 10.2% of its appearances. Read on for Shadow Shield’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Defect run.

Best Cards to Pair with Shadow Shield

Ranked by win-rate lift, Shadow Shield performs best alongside Overclock (+25.8%), Machine Learning (+22.6%), and Skim (+19.2%).

Overclock+25.8%7 runsMachine Learning+22.6%6 runsSkim+19.2%12 runsSupercritical+19.0%5 runsSmokestack+16.3%6 runsCompact+15.4%10 runs

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

Shadow Shield Win Rate by Class

Shadow Shield is drafted only by the Defect, where it holds a 23.1% win rate across 59 runs.

The Defectappears in 10.1% of its runs (59 tracked)

Best Relics for Shadow Shield

Shadow Shield pairs best with the relics Bag of Marbles (+28.5%), Pendulum (+23.5%), and Bag of Preparation (+16.3%), ranked by win-rate lift.

Bag of Marbles+28.5%10 runsPendulum+23.5%11 runsBag of Preparation+16.3%7 runsFestive Popper+14.8%4 runsLetter Opener+12.3%5 runsSymbiotic Virus+12.3%6 runs

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

Shadow Shield Card Details

Shadow Shield is an uncommon skill costing 2 energy; it’s upgraded in 23.4% of runs and usually picked up by floor 16.

Gain 11 Block. Channel 1 Dark.

Upgrade: +4 Block

What Ends Runs with Shadow Shield

Shadow Shield’s most common run-enders are Queen Boss (10.2%), Knowledge Demon Boss (6.8%), and Kaiser Crab Boss (5.1%).

• Queen Boss10.2% of runs
• Knowledge Demon Boss6.8% of runs
• Kaiser Crab Boss5.1% of runs
• Doormaker Boss5.1% of runs
• The Kin Boss5.1% of runs

See Also

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