Astrolabe Relic

Is Astrolabe good in Slay the Spire 2?

In Slay the Spire 2, Astrolabe is an ancient relic you can pick up on your climb. Its effect: Upon pickup, Transform cards, then Upgrade them. The data marks it as a weaker relic, settling at D tier — rarely a run-defining grab.

Over 224 tracked runs the win rate of decks holding it sits at 35.8%, 21.9% ahead of the 13.8% all-run baseline. It sees lighter play, carried in only 1.1% of runs. It does its best work in the hands of the Necrobinder, who post a 40.0% win rate with it. Within Necrobinder runs specifically, it’s carried 1.1% of the time.

Its standout card pairing is Mad Science, which lifts the relic’s win rate by +47.6% when both are in play. It also works nicely with Wisp, good for a +25.4% win-rate change. It typically enters the deck near floor 21. As an ancient relic, how often it’s offered depends on its rarity tier.

Of the runs that carried it, 79 ended in victory while 142 fell to a defeat. Its most common run-ender is Test Subject Boss, finishing 7.1% of the runs it appears in. See the best cards, class split, and threats below for the full read on whether Astrolabe is worth grabbing.

Pick or Skip: Astrolabe

Across 224 offers Astrolabe has a 100.0% pick rate; the 224 runs that took it and 0 that left it are still below the sample floor, so no win rate is shown.

Taken 224 times out of 224 offers.

A win rate is only shown once that side clears the sample floor. Below it you get the run counts and nothing else — a 0% here would be a reporting artefact, not a result.

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 Astrolabe

The cards that gain the most from carrying Astrolabe are Mad Science (+47.6%), Wisp (+25.4%), and Afterimage (+19.8%), each shown with its win-rate swing.

Mad Science+47.6%24 runsWisp+25.4%18 runsAfterimage+19.8%18 runsCalculated Gamble+17.6%15 runsFriendship+17.6%15 runsEnfeebling Touch+14.3%16 runs

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

Astrolabe Win Rate by Class

Of the 5 classes that carry Astrolabe, it performs best with Necrobinder (40.0%), Regent (40.0%), and Defect (35.7%).

The Necrobinder40.0%40 runsThe Regent40.0%25 runsThe Defect35.7%43 runsThe Silent34.5%56 runsThe Ironclad31.0%59 runs

Astrolabe Details

Carried in 1.1% of runs, Astrolabe is an ancient relic typically acquired near floor 21.

Upon pickup, Transform cards, then Upgrade them.

What Ends Runs with Astrolabe

Runs carrying Astrolabe end most often against Test Subject Boss (7.1%), Queen Boss (6.3%), and Kaiser Crab Boss (4.9%) — the share of its runs each accounts for is shown.

• Test Subject Boss7.1% of runs
• Queen Boss6.3% of runs
• Kaiser Crab Boss4.9% of runs
• Knowledge Demon Boss4.9% of runs
• Infested Prisms Elite4.5% of runs

See Also

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