Book Repair KnifeRelic
Whenever a non-Minion enemy dies to Doom, heal HP.
Is Book Repair Knife good in Slay the Spire 2?
In Slay the Spire 2, Book Repair Knife is an uncommon relic you can pick up on your climb. Its effect: Whenever a non-Minion enemy dies to Doom, heal HP. The data marks it as a weaker relic, settling at D tier — rarely a run-defining grab.
Over 6 tracked runs the win rate of decks holding it sits at 20.0%, 7.4% ahead of the 12.6% all-run baseline. It sees lighter play, carried in only 1.2% of runs. It does its best work in the hands of the Necrobinder, who post a 20.0% win rate with it. Within Necrobinder runs specifically, it’s carried 3.5% of the time.
Its standout card pairing is Ascender's Bane, which lifts the relic’s win rate by +13.3% when both are in play. It also works nicely with Reanimate, good for a +13.3% win-rate change. It typically enters the deck near floor 17. As an uncommon relic, how often it’s offered depends on its rarity tier.
Of the runs that carried it, 1 ended in victory while 4 fell to a defeat. Its most common run-ender is Test Subject Boss, finishing 33.3% of the runs it appears in. See the best cards, class split, and threats below for the full read on whether Book Repair Knife is worth grabbing.
Book Repair Knife Win Rate & Pick Rate
At a 20.0% win rate, Book Repair Knife runs 7.4% ahead of the 12.6% all-run baseline — the bars below put the two side by side.
Run Outcomes with Book Repair Knife
Across the 6 runs that carried Book Repair Knife, 1 ended in a win and 5 in a loss — a 16.7% win share, counting abandons as losses.
- Wins 16.7%
- Losses 83.3%
Best Cards with Book Repair Knife
The cards that gain the most from carrying Book Repair Knife are Ascender's Bane (+13.3%), Reanimate (+13.3%), and Friendship (+13.3%), each shown with its win-rate swing.
Based on small co-occurring samples — treat these as early signals, not final verdicts.
Book Repair Knife Win Rate by Class
Book Repair Knife’s class data comes mostly from the Necrobinder, at a 20.0% win rate over 6 runs.
The Necrobinderappears in 3.5% of its runs (6 tracked)Book Repair Knife Details
Carried in 1.2% of runs, Book Repair Knife is an uncommon relic typically acquired near floor 17.
Whenever a non-Minion enemy dies to Doom, heal HP.
What Ends Runs with Book Repair Knife
Runs carrying Book Repair Knife end most often against Test Subject Boss (33.3%) — the share of its runs each accounts for is shown.
- Test Subject Boss33.3% of runs
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Book Repair Knife – Frequently Asked Questions
Is Book Repair Knife good in Slay the Spire 2?
Across 6 tracked runs carrying it, Book Repair Knife wins 20.0% of the time — +7.4% above the average run. Win rate reflects how often runs with the relic end in victory.
What does Book Repair Knife do in Slay the Spire 2?
Whenever a non-Minion enemy dies to Doom, heal HP.
How rare is Book Repair Knife in Slay the Spire 2?
Book Repair Knife is an Uncommon relic, picked up in 1.2% of tracked runs.
What is the best card to use with Book Repair Knife?
In tracked runs, Book Repair Knife has performed best alongside Ascender's Bane, which lifts its win rate by +13.3% over 4 runs together.
See Also
Keep exploring Slay the Spire 2 tier lists and stats below.