Eidolon Skill

Is Eidolon good in Slay the Spire 2?

Eidolon is a rare Necrobinder skill in Slay the Spire 2. In combat it resolves as: Exhaust your Hand. If 9 cards were Exhausted this way, gain 1 Intangible. It’s a dependable, middle-of-the-pack option, landing at C tier in our rankings.

Across 68 recorded runs, decks running it win 26.5% of the time, comfortably clear of the 13.8% average, by 12.6%. It’s a more selective pick, turning up in just 0.3% of decks that could run it. Offer data backs the pick — taken 5.7% of the time it is shown, with 39.0% for runs that took it against 31.7% for runs that did not, a +5.9% pick lift across 41 decided runs. Necrobinder players keep it in 1.8% 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 Wisp — together they post a +12.5% swing in win rate. It also has strong chemistry with the relic Bound Phylactery, which moves its win rate by -4.7%. At 2 energy, it’s upgraded in 32.9% of runs and usually joins the deck around floor 15.

Upgraded, it gains -1 EnergyCost, which is why so many decks invest a rest-site upgrade in it. That’s 18 wins, 50 deaths, and 0 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Decimillipede Elite, which closes out 5.9% of its appearances. Read on for Eidolon’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Necrobinder run.

Pick or Skip: Eidolon

Out of 755 recorded offers Eidolon is taken 5.7% of the time, and taking it is worth +5.9% in pick lift — 39.0% for runs that picked it against 31.7% for runs that skipped, across 41 decided runs.

Taken 43 times out of 755 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 Eidolon

Eidolon is strongest when it joins the deck in Act 2, where runs win 64.7% across 17 runs — one of 4 recorded pickup windows.

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

Best Cards to Pair with Eidolon

Ranked by win-rate lift, Eidolon performs best alongside Wisp (+12.5%), Capture Spirit (+12.1%), and Deathbringer (+10.6%).

Wisp+12.5%25 runsCapture Spirit+12.1%15 runsDeathbringer+10.6%16 runsNegative Pulse+9.3%17 runsDefy+8.3%35 runsInvoke+7.7%27 runs

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

Eidolon Win Rate by Class

Eidolon is drafted only by the Necrobinder, where it holds a 24.2% win rate across 66 runs.

The Necrobinderappears in 1.8% of its runs (66 tracked)

Best Relics for Eidolon

Eidolon pairs best with the relics Bound Phylactery (-4.7%) and Arcane Scroll (-7.9%), ranked by win-rate lift.

Bound Phylactery-4.7%62 runsArcane Scroll-7.9%15 runs

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

Eidolon Card Details

Eidolon is a rare skill costing 2 energy; it’s upgraded in 32.9% of runs and usually picked up by floor 15.

Exhaust your Hand. If 9 cards were Exhausted this way, gain 1 Intangible.

Upgrade: -1 EnergyCost

What Ends Runs with Eidolon

Eidolon’s most common run-enders are Decimillipede Elite (5.9%), Aeonglass Boss (5.9%), and Queen Boss (4.4%).

• Decimillipede Elite5.9% of runs
• Aeonglass Boss5.9% of runs
• Queen Boss4.4% of runs
• Infested Prisms Elite2.9% of runs
• Phrog Parasite Elite2.9% of runs

See Also

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