Book Repair Knife•Relic

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 19 tracked runs the win rate of decks holding it sits at 29.4%, 10.5% ahead of the 18.9% all-run baseline. It sees lighter play, carried in only 0.5% of runs. It does its best work in the hands of the Necrobinder, who post a 29.4% win rate with it. Within Necrobinder runs specifically, it’s carried 2.3% of the time.

Its standout card pairing is Cleanse, which lifts the relic’s win rate by +45.6% when both are in play. It also works nicely with Fetch, good for a +37.3% win-rate change. It typically enters the deck near floor 23. As an uncommon relic, how often it’s offered depends on its rarity tier.

Of the runs that carried it, 5 ended in victory while 12 fell to a defeat. Its most common run-ender is Test Subject Boss, finishing 15.8% 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.

Best Cards with Book Repair Knife

The cards that gain the most from carrying Book Repair Knife are Cleanse (+45.6%), Fetch (+37.3%), and Spur (+37.3%), each shown with its win-rate swing.

Cleanse+45.6%4 runsFetch+37.3%3 runsSpur+37.3%3 runsRight Hand Hand+37.3%3 runsCalcify+37.3%3 runsAfterlife+37.3%3 runs

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 29.4% win rate over 19 runs.

The Necrobinderappears in 2.3% of its runs (19 tracked)

Book Repair Knife Details

Carried in 0.5% of runs, Book Repair Knife is an uncommon relic typically acquired near floor 23.

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 (15.8%) and Kaiser Crab Boss (10.5%) — the share of its runs each accounts for is shown.

• Test Subject Boss15.8% of runs
• Kaiser Crab Boss10.5% of runs

See Also

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