Arsenal Power

Is Arsenal good in Slay the Spire 2?

Arsenal is a rare Regent power in Slay the Spire 2. In combat it resolves as: Whenever you create a card, gain 1 Strength. It’s a dependable, middle-of-the-pack option, landing at C tier in our rankings.

Across 264 recorded runs, decks running it win 40.5% of the time, comfortably clear of the 14.3% average, by 26.2%. It’s a more selective pick, turning up in just 1.0% of decks that could run it. Offer data backs the pick — taken 29.4% of the time it is shown, with 43.9% for runs that took it against 30.8% for runs that did not, a +12.6% pick lift across 198 decided runs. Regent players keep it in 5.5% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.2 times in the decks that take it.

It performs best next to Bombardment — together they post a +26.3% swing in win rate. It also has strong chemistry with the relic Stone Calendar, which moves its win rate by +33.8%. At 1 energy, it’s upgraded in 43.5% of runs and usually joins the deck around floor 17.

That’s 106 wins, 156 deaths, and 2 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Decimillipede Elite, which closes out 7.6% of its appearances. Read on for Arsenal’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Regent run.

Pick or Skip: Arsenal

Out of 720 recorded offers Arsenal is taken 29.4% of the time, and taking it is worth +12.6% in pick lift — 43.9% for runs that picked it against 30.8% for runs that skipped, across 198 decided runs.

Taken 212 times out of 720 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.

When to Pick Up Arsenal

Arsenal is strongest when it joins the deck in Act 3, where runs win 82.3% across 17 runs — one of 4 recorded pickup windows.

Win rate of runs by the act Arsenal entered the deck. Acts that have not reached the sample floor show their run count only.

Best Cards to Pair with Arsenal

Ranked by win-rate lift, Arsenal performs best alongside Bombardment (+26.3%), Crash Landing (+24.4%), and Bundle of Joy (+22.6%).

Bombardment+26.3%26 runsCrash Landing+24.4%24 runsBundle of Joy+22.6%44 runsMad Science+22.5%25 runsGUARDS!!!+22.4%33 runsMake It So+20.8%26 runs

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

Arsenal Win Rate by Class

Arsenal is drafted only by the Regent, where it holds a 40.3% win rate across 255 runs.

The Regentappears in 5.5% of its runs (255 tracked)

Best Relics for Arsenal

Arsenal pairs best with the relics Stone Calendar (+33.8%), Ornamental Fan (+30.7%), and Kusarigama (+25.4%), ranked by win-rate lift.

Stone Calendar+33.8%17 runsOrnamental Fan+30.7%21 runsKusarigama+25.4%28 runsMercury Hourglass+25.4%28 runsMummified Hand+25.1%16 runsVenerable Tea Set+24.7%53 runs

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

Arsenal Card Details

Arsenal is a rare power costing 1 energy; it’s upgraded in 43.5% of runs and usually picked up by floor 17.

Whenever you create a card, gain 1 Strength.

What Ends Runs with Arsenal

Arsenal’s most common run-enders are Decimillipede Elite (7.6%), Queen Boss (3.8%), and Test Subject Boss (3.8%).

• Decimillipede Elite7.6% of runs
• Queen Boss3.8% of runs
• Test Subject Boss3.8% of runs
• Entomancer Elite3.8% of runs
• Knowledge Demon Boss3.4% of runs

See Also

Compare Arsenal with the rest of the best Slay the Spire 2 cards, relics, and classes below.