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 76 tracked runs the win rate of decks holding it sits at 36.0%, 22.6% ahead of the 13.4% 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 36.0% win rate with it. Within Necrobinder runs specifically, it’s carried 2.6% of the time.

Its standout card pairing is Dirge, which lifts the relic’s win rate by +25.1% when both are in play. It also works nicely with Sleight of Flesh, good for a +19.6% win-rate change. It typically enters the deck near floor 21. As an uncommon relic, how often it’s offered depends on its rarity tier.

Of the runs that carried it, 27 ended in victory while 48 fell to a defeat. Its most common run-ender is Test Subject Boss, finishing 7.9% 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.

Pick or Skip: Book Repair Knife

Players take Book Repair Knife in 49.1% of the 159 offers it appears in; those runs win 37.7% against 28.4% for runs that passed, a pick lift of +8.2% over 77 decided runs.

Taken 78 times out of 159 offers.

Pick rate when offered counts offers, not runs: out of every time the game put this in front of a player, how often it was taken. It is not the same number as the share of runs that end up containing it.

Pick lift is the sample-adjusted gap between runs that took the option and runs that passed on it. It is the fair way to rank choices, because raw win rates put the smallest samples on top.

Best Cards with Book Repair Knife

The cards that gain the most from carrying Book Repair Knife are Dirge (+25.1%), Sleight of Flesh (+19.6%), and Debilitate (+16.9%), each shown with its win-rate swing.

Dirge+25.1%18 runsSleight of Flesh+19.6%19 runsDebilitate+16.9%17 runsEnfeebling Touch+11.8%23 runsFear+11.1%17 runsSpur+11.1%17 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 36.0% win rate over 76 runs.

The Necrobinderappears in 2.6% of its runs (76 tracked)

Book Repair Knife Details

Carried in 0.5% of runs, Book Repair Knife is an uncommon relic typically acquired near floor 21.

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 (7.9%), Decimillipede Elite (6.6%), and Knights Elite (3.9%) — the share of its runs each accounts for is shown.

• Test Subject Boss7.9% of runs
• Decimillipede Elite6.6% of runs
• Knights Elite3.9% of runs
• Kaiser Crab Boss3.9% of runs
• Waterfall Giant Boss3.9% of runs

See Also

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