Diamond Diadem•Relic

Is Diamond Diadem good in Slay the Spire 2?

In Slay the Spire 2, Diamond Diadem is an ancient relic you can pick up on your climb. Its effect: Whenever you play or fewer cards in a turn, take half damage from enemies. Performance-wise it’s a steady, unspectacular pick rated C tier overall.

Over 38 tracked runs the win rate of decks holding it sits at 57.9%, 43.9% ahead of the 14.0% all-run baseline. It sees lighter play, carried in only 0.3% of runs. It does its best work in the hands of the Regent, who post a 70.0% win rate with it. Within Regent runs specifically, it’s carried 0.5% of the time.

Its standout card pairing is Ascender's Bane, which lifts the relic’s win rate by +1.2% when both are in play. It typically enters the deck near floor 33. As an ancient relic, how often it’s offered depends on its rarity tier.

Of the runs that carried it, 22 ended in victory while 16 fell to a defeat. Its most common run-ender is Test Subject Boss, finishing 21.1% of the runs it appears in. See the best cards, class split, and threats below for the full read on whether Diamond Diadem is worth grabbing.

Pick or Skip: Diamond Diadem

Across 38 offers Diamond Diadem has a 100.0% pick rate; the 38 runs that took it and 0 that left it are still below the sample floor, so no win rate is shown.

Taken 38 times out of 38 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 Diamond Diadem

The cards that gain the most from carrying Diamond Diadem are Ascender's Bane (+1.2%), each shown with its win-rate swing.

Ascender's Bane+1.2%22 runs

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

Diamond Diadem Win Rate by Class

Of the 2 classes that carry Diamond Diadem, it performs best with Regent (70.0%) and Ironclad (66.7%).

The Regent70.0%10 runsThe Ironclad66.7%12 runs

Diamond Diadem Details

Carried in 0.3% of runs, Diamond Diadem is an ancient relic typically acquired near floor 33.

Whenever you play or fewer cards in a turn, take half damage from enemies.

What Ends Runs with Diamond Diadem

Runs carrying Diamond Diadem end most often against Test Subject Boss (21.1%) and Knights Elite (5.3%) — the share of its runs each accounts for is shown.

• Test Subject Boss21.1% of runs
• Knights Elite5.3% of runs

See Also

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