FastenPower
Gain an additional Block from Defend cards.
Is Fasten good in Slay the Spire 2?
In Slay the Spire 2, Fasten is an uncommon power from the Colorless card pool. Its effect: Gain an additional Block from Defend cards. The data flags it as a weaker pick, settling at D tier — usually one to pass on unless your deck specifically wants it.
Over 8 tracked runs its win rate sits at 0.0%, 12.6% short of the 12.6% all-deck baseline. It sees niche play, included in only 1.5% of eligible runs. Within Regent runs it’s drafted 1.8% of the time, making it a regular part of that class’s decks. Decks that include it run about 1.0 copies on average.
Its standout pairing so far is Ascender's Bane, which lifts its win rate by 0.0% when the two share a deck. On the relic side, Divine Right is its standout companion, worth a 0.0% win-rate swing alongside it. It costs 1 energy, gets upgraded 25.0% of the time, and tends to be picked up near floor 11.
Of the runs that drafted it, 0 ended in victory against 7 deaths and 1 abandons. See the synergies, class split, and threats below for the full picture of where Fasten fits a Colorless deck.
Fasten Win Rate & Pick Rate
At a 0.0% win rate, Fasten runs 12.6% behind the 12.6% all-deck baseline — the bars below put the two side by side.
Run Outcomes with Fasten
Across the 8 tracked runs that drafted Fasten, 0 ended in a win and 8 in a loss — a 0.0% win share, counting abandons as losses.
- Wins 0.0%
- Losses 100.0%
Best Cards to Pair with Fasten
Fasten’s strongest card pairings so far are Ascender's Bane (0.0%), Crescent Spear (0.0%), and Defend (0.0%), each shown with the win-rate lift it adds.
Based on small co-occurring samples — treat these as early signals, not final verdicts.
Fasten Win Rate by Class
Of the 4 classes that draft Fasten, it performs best with Regent (0.0%), Defect (0.0%), and Necrobinder (0.0%).
Best Relics for Fasten
The relics that swing Fasten’s win rate the most are Divine Right (0.0%), Bag of Preparation (0.0%), and Potion Belt (0.0%), with each lift shown.
Based on small co-occurring samples — treat these as early signals, not final verdicts.
Fasten Card Details
A 1-energy uncommon power, Fasten is upgraded 25.0% of the time and tends to enter the deck around floor 11.
Gain an additional Block from Defend cards.
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Fasten – Frequently Asked Questions
Is Fasten good in Slay the Spire 2?
Across 8 tracked runs, Fasten has a 0.0% win rate — +12.6% below the average deck. Win rate reflects how often runs that include the card end in victory.
What does Fasten do in Slay the Spire 2?
Fasten costs 1 energy. Gain an additional Block from Defend cards.
What class is Fasten in Slay the Spire 2?
Fasten is an Uncommon Colorless Power.
Is Fasten worth upgrading in Slay the Spire 2?
Fasten can be upgraded at a rest site to improve its effect.
What is the best relic for Fasten?
In tracked runs, Fasten has performed best alongside Divine Right, which lifts its win rate by 0.0% over 3 runs together.
See Also
Keep exploring Slay the Spire 2 tier lists and stats below.