Necrobinder — Complete Build Guide
The Necrobinder is the flagship new character of Slay the Spire 2. Through commanding armies of corrupted undead, managing sacrifice actions, and leveraging a unique dual-resource system, the Necrobinder is the most mechanically complex — and rewarding — class in the game.
Difficulty: Advanced. This is not a recommended starting character for new players, but for veterans the Necrobinder offers the highest skill ceiling and the most explosive end-game potential.
Starting Stats
| Stat | Value |
|---|---|
| Starting HP | 72 |
| Max HP | 72 |
| Starting Energy | 3 |
| Starting Deck Size | 10 |
| Unique Resource | Soul Shards |
| Passive | Summoned minions persist between combats (up to 3) |
The Soul Shard mechanic is what sets Necrobinder apart. Several cards cost Soul Shards instead of or in addition to Energy. You generate Shards by sacrificing minions, using Corrupted cards, or through specific relics. Managing your Shard economy is the central skill of playing this character.
Core Mechanics
Summoning
Summon cards create a minion token — a persistent entity that attacks, blocks, or applies debuffs each turn. Minions survive between rooms (up to your Summon Limit, which starts at 3).
Each minion has:
- Attack value — damage dealt to a random enemy at start of your turn
- HP — minions can be damaged and die
- Sacrifice ability — you can deliberately kill a minion to trigger an effect
Corrupted Cards
A subset of Necrobinder cards has the Corrupted tag. They are more powerful than standard cards but cost Soul Shards, deal damage to you when played, or have a negative lingering effect when retained. Strong Corrupted cards include:
| Card | Effect | Cost |
|---|---|---|
| Plague Caller | Summon 2 Plague Rats (1 ATK / 6 HP each) | 1 Energy + 1 Shard |
| Lich Form | Lose 4 HP per turn; gain 2 Shards per turn | 3 Energy (Power) |
| Death Harvest | Deal damage equal to your current Shard count to ALL enemies | 2 Energy |
| Soul Drain | Sacrifice a minion, draw 3 cards | 0 Energy |
Core Archetypes
Archetype 1: Wide Summon Board
Concept: Maximize your Summon Limit and field as many minions as possible. Your minion army attacks once per turn before you even play a card, creating overwhelming passive damage.
Key Cards
| Card | Rarity | Role |
|---|---|---|
| Raise Dead | Common | Summon 1 Skeleton (2 ATK / 8 HP) |
| Necrotic Expansion | Uncommon | Increase Summon Limit by 1 |
| Plague Caller | Common | Summon 2 Plague Rats |
| March of the Undead | Rare | All minions attack an extra time this turn |
| Bone Wall | Uncommon | Block = number of minions × 5 |
| Rally the Fallen | Rare | Resummon all dead minions at 50% HP |
How to Win: Hit 5–6 minions on board with at least one minion buffing via March of the Undead. In Act 3 elite fights, your board alone deals 20–30 damage before your turn.
Relic Priorities
- Undying Legion Standard — Your summons gain +1 ATK and +4 HP.
- Shard Accumulator — Start each combat with 3 Soul Shards instead of 0.
- Ossuary — At the end of combat, heal 2 HP per living minion.
Archetype 2: Corruption Loop (Sacrifice Engine)
Concept: Deliberately sacrifice your own minions to generate Soul Shards, which fuel your most powerful Corrupted cards. The loop is: Summon → Sacrifice → Generate Shards → Play Corrupted cards → Repeat.
Key Cards
| Card | Rarity | Role |
|---|---|---|
| Soul Drain | Common | Sacrifice a minion, draw 3 |
| Carrion Feeder | Uncommon | Minion sacrifices deal damage to all enemies |
| Lich Form | Rare | Powerful long-run engine (Power card) |
| Death Harvest | Uncommon | Damage scales with current Shard count |
| Dark Ritual | Rare | Exhaust 2 cards, gain 4 Shards |
| Necrotic Surge | Uncommon | This turn, Corrupted cards cost 0 Shards |
How to Win: Stack Soul Shards via Soul Drain chains, then unleash Death Harvest for massive burst. Necrotic Surge + Death Harvest with 8+ Shards is an instant-kill on most Act 3 elites.
Relic Priorities
- Corrupted Ritual Dagger — Corrupted cards deal 50% more damage (but also deal 50% more self-damage).
- Sacrificial Altar — Each sacrifice generates 1 extra Soul Shard.
- Vile Phylactery — Lich Form no longer deals HP loss per turn; instead it Corrupts 1 card at start of each turn.
Managing the HP Trade-off
The Necrobinder starts with 72 HP (lowest of all characters) and several powerful cards deal self-damage when played. This is intentional — the character rewards players who understand the difference between HP as a resource and HP as a countdown to death.
Key rules:
- Never play Corrupted cards when below 25 HP unless you have a guaranteed lethal or healing source.
- Lich Form is your strongest win condition but also your biggest risk. Deploy it only when you can close out the fight within 4–5 turns.
- Ossuary and Vampiric Aura relics are not just flavour — take them whenever offered.
Act-by-Act Priority Checklist
Act 1 Goals
- Establish 2–3 baseline summon cards (Raise Dead, Plague Caller)
- Get at least 1 Soul Drain for card draw
- Reach the Boss with 55+ HP
Act 2 Goals
- Pick your primary archetype (Wide Board or Sacrifice Loop)
- Acquire Necrotic Expansion if going Wide
- Acquire Dark Ritual or Carrion Feeder if going Loop
- Get a healing relic (Ossuary, Vampiric Aura, or merchant HP purchase)
Act 3 Goals
- Reach Shard generation of 4+ per cycle
- Trim low-value summons — quality over quantity
- Ensure a Heart counter (either massive board damage or Death Harvest burst)
Frequently Asked Questions
Q: Should I prioritize Summon Limit or Shard generation early?
A: Act 1 — Summon Limit. You need a basic board to survive. Act 2 onwards, Shard generation becomes the priority if you're building into the Sacrifice loop.
Q: Is Lich Form always worth taking?
A: In 90% of runs, yes — but only if you take it before Act 3. Taking it at Act 3 Boss camp with no healing is dangerous. Early Lich Form + Vampiric Aura relic is one of the strongest combos in the game.
Q: What counters the Necrobinder hardest?
A: Enemies with AoE clearing multiple minions (Slime Boss, Act 3 multi-attack elites). Build block density from your summon width and avoid over-committing low-HP minions against these fights.
Q: How many cards should the ideal Necrobinder deck have?
A: 18–22 cards. Wider than other characters because you need both Summon cards AND Shard generation cards AND Corrupted payoffs. Trimming too aggressively leaves you with dead turns.