Prolong•Skill

Is Prolong good in Slay the Spire 2?

In Slay the Spire 2, Prolong is an uncommon skill from the Colorless card pool. Its effect: Next turn, gain Block equal to your current Block. Right now it’s a premium pick that sits at B tier — one of the better cards you can add to a deck this run.

Over 49 tracked runs its win rate sits at 38.6%, 19.7% ahead of the 18.9% all-deck baseline. It sees niche play, included in only 1.3% of eligible runs. Within Defect runs it’s drafted 2.0% of the time, making it a regular part of that class’s decks. Decks that include it run about 1.1 copies on average.

Its standout pairing so far is Charge Battery, which lifts its win rate by +17.5% when the two share a deck. On the relic side, Venerable Tea Set is its standout companion, worth a +21.7% win-rate swing alongside it. It costs 0 energy, gets upgraded 35.9% of the time, and tends to be picked up near floor 21.

Of the runs that drafted it, 17 ended in victory against 27 deaths and 5 abandons. Its most common run-ender is Decimillipede Elite, finishing 6.1% of the runs it shows up in. See the synergies, class split, and threats below for the full picture of where Prolong fits a Colorless deck.

Best Cards to Pair with Prolong

Prolong’s strongest card pairings so far are Charge Battery (+17.5%), Capacitor (+16.2%), and Supercritical (+14.2%), each shown with the win-rate lift it adds.

Charge Battery+17.5%5 runsCapacitor+16.2%8 runsSupercritical+14.2%3 runsHologram+14.2%3 runsStone Armor+13.8%5 runsLightning Rod+13.5%7 runs

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

Prolong Win Rate by Class

Of the 5 classes that draft Prolong, it performs best with Defect (54.5%), Ironclad (41.7%), and Necrobinder (37.5%).

The Defect54.5%12 runsThe Ironclad41.7%13 runsThe Necrobinder37.5%10 runsThe Silent28.6%7 runsThe Regent16.7%7 runs

Best Relics for Prolong

The relics that swing Prolong’s win rate the most are Venerable Tea Set (+21.7%), Bag of Preparation (+17.9%), and Vajra (+17.9%), with each lift shown.

Venerable Tea Set+21.7%9 runsBag of Preparation+17.9%11 runsVajra+17.9%13 runsBronze Scales+17.9%11 runsYummy Cookie+17.5%4 runsMembership Card+17.5%4 runs

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

Prolong Card Details

A 0-energy uncommon skill, Prolong is upgraded 35.9% of the time and tends to enter the deck around floor 21.

Next turn, gain Block equal to your current Block.

What Ends Runs with Prolong

Runs holding Prolong end most often against Decimillipede Elite (6.1%), Kaiser Crab Boss (4.1%), and Louse Progenitor Normal (4.1%) — the share of its runs each accounts for is shown.

• Decimillipede Elite6.1% of runs
• Kaiser Crab Boss4.1% of runs
• Louse Progenitor Normal4.1% of runs
• Test Subject Boss4.1% of runs
• Devoted Sculptor Weak4.1% of runs

See Also

Keep exploring Slay the Spire 2 tier lists and stats below.