Sample real draw orders, track Soul density, and see when the Necrobinder shell actually reaches execute pressure. This is the advanced version: No Escape, Haunt, and Soul sources all matter.
100Target HP
T5.3Average threshold turn
82%Ready rate by turn 6
135.5Average pressure by turn 6
A-Grade Page Scope
This Simulator Is For Engine Timing, Not Exact Combat Scripts
The simulator exists for the long-fight question: how quickly a No Escape shell crosses real execute pressure once draw order, Souls, and Haunt density start mattering.
When It Helps
Use it when averages and high-roll bands matter
It is strongest for bosses, elites, or slow engine fights where Doom growth timing matters more than one exact hand you already know.
Where It Lies
Average turn is not a guaranteed turn
If the fight is short, if draw manipulation changes everything, or if you only care about one exact board state, an average threshold read can look smarter than it really is.
Input Boundary
Deck size, engine copies, turns, and target HP are the model
The page samples draw orders from the listed engine inputs and compares them to the selected HP line. It does not simulate every relic, every card text, or every combat branch.
How It Works
How the No Escape Doom Growth Simulator Models Your Engine
This simulator samples real draw orders from your deck composition across multiple simulated turns, then tracks when the accumulated Doom crosses the target HP threshold. It is modeling engine timing and draw variance, not one specific hand you already know.
Reviewed2026-03-29
How to Use It
Configure the deck and engine before running the simulation
Enter your current HP and the enemy HP you are trying to execute. Then describe your deck: the Doom-applying cards you are running, how many copies of each, and any relevant powers like Countdown or Oblivion. Set the simulation turn count to match how many turns the fight is likely to last based on act and room type.
The simulator then runs multiple sampled draw orders across that turn count and reports the distribution of Doom totals at each turn. The result shows not just the average outcome but the spread — whether your engine reliably executes by turn 4, or whether it does so only in favorable draw sequences.
Enter exact copies of each Doom card — one copy of Scourge plays very differently from two.
Include Countdown and Oblivion if active — they contribute Doom independently of your hand plays.
Set enemy HP to the actual value you need to hit, not a round number.
The turn range controls simulation depth: short for elites, longer for bosses.
What It Models
Draw variance across sampled turn sequences
Each simulation pass randomly orders your deck, then plays through the specified turn count tracking Doom applied per turn and cumulative total. Running many passes produces a distribution showing what percentage of draw sequences reach the execute threshold by each turn. The output reflects genuine draw variance, not just expected-value arithmetic.
The model accounts for the No Escape scaling mechanic: Doom applied by No Escape scales with existing Doom, so early Doom application compounds into higher late-game totals. Cards played earlier in the simulation affect the damage ceiling of cards played later, which is why draw order matters and why the distribution has real variance rather than being a fixed number.
Where It Stops
Block, enemy attacks, and power timing are not modeled
The simulator models Doom accumulation only. It does not model whether you survive to the turn where Doom executes, how block interacts with the fight, or whether the enemy has mechanics that remove Doom. It also does not model multi-enemy rooms — Doom is tracked against a single HP target.
If your Doom engine is reliable but you keep dying before it fires, that is a block problem the simulator cannot diagnose. Use the Doom threshold results as a ceiling — the number of turns until execution in a favorable draw — and pair it with your own assessment of whether the deck can survive that long.
Maintenance Signals
Who Maintains This Page
A calculator without ownership is just a fancy guess. These signals show who maintains the tool, which live ruleset it matches, and where the responsibility boundary stops.
Maintained bySTS2 Calculator Tools Desk
Independent fan-made editors and data maintainers. This is not an official Slay the Spire 2 or Mega Crit property.
Responsible editorSTS2 Calculator Site Operator
Final site operator and responsible editor. Final contact for corrections, rights notices, and maintenance triage via shwuhen@gmail.com.
Last reviewedMarch 28, 2026
Visible copy, links, and page-level signals were checked in the latest review pass.
Patch verifiedCurrent Early Access Doom growth simulator model
If a patch moves the numbers, wording, or assumptions behind this page, the page gets revised, narrowed, or rechecked again.
Applies toNo Escape Doom growth samples, Haunt or Soul density assumptions, and execute-timing estimates driven by the simulator inputs.
Tool pages cover the math, tables, and assumptions surfaced by the current UI on this route.
DisclaimerTool output is only as honest as the current inputs and published assumptions.
Bad inputs, hidden fight modifiers, or unsupported edge cases still produce bad conclusions. The tool does not guess those for you.
Pick the room you care about, or override it with a custom HP value if you are planning around the exact board state in front of you.
The Adversary Mk. I uses the fixed HP value from the current preset.
Engine Setup
The base deck size matters because filler cards are what make good engines miss. Keep the inputs honest.
Filler cards13
Combat-start Souls3
Sample runs320
Soul Sources
These sources change how often the deck actually finds Souls instead of just pretending they are there.
Funerary Mask
Adds Souls before the first draw.
Relic
1
Grave Warden
Stable one-Soul setup that does not cost HP.
1 Cost
1
Capture Spirit
Adds Souls and immediate chip to the target.
1 Cost
1
Reave
Puts a Soul on the bottom of the draw pile after an attack.
1 Cost
0
Severance
Spreads one Soul across hand, draw, and discard.
2 Cost
0
Seance
Turns one draw-pile card into a Soul.
1 Cost
0
Dirge
Turns leftover energy into immediate Soul density.
X Cost
0
Glimpse Beyond
Co-op only. Loads every player with Souls, including your own draw pile.
1 Cost
0
Co-op only
Growth Snapshot
The line can reach 100 pressure, but it still swings between turn orders instead of landing cleanly every run.
Average thresholdT5.3
High-roll thresholdT5
Stable thresholdT6
Average Souls per turn1.4
Pressure Curve
Pressure means Doom plus all chip damage already pushed onto the target. The pink guide line is the selected HP threshold.
Turn 1Turn 6
Turn Breakdown
The table below is the honest read: average Doom, average chip, high-roll pressure, and how often the target is already dead on paper.
Turn
Avg Doom
Avg Chip
Avg Pressure
High Roll
Ready Rate
1
6.5
1.8
8.3
12
0%
2
14.9
6.8
21.7
27
0%
3
27.8
20.7
48.6
59
1%
4
43.7
28.4
72
85
13%
5
63.5
37.1
100.6
115
47%
6
92
43.5
135.5
162
82%
Benchmark Board
These thresholds use the same growth curve, then compare it against current elite and boss HP ceilings.
The Adversary Mk. IAct 1 · boss
100
Avg: T5.3High roll: T5Stable: T6Ready: 82%
FabricatorAct 2 · boss
150
Avg: T5.8High roll: T6Stable: T6Ready: 35%
Lagavulin MatriarchAct 3 · boss
222
Avg: T5.9High roll: T6Stable: T6Ready: 6%
Owl MagistrateAct 3 · boss
234
Avg: T5.9High roll: T6Stable: T6Ready: 4%
Waterfall GiantAct 3 · boss
240
Avg: T5.9High roll: T6Stable: T6Ready: 4%
Kin PriestAct 2 · boss
190
Avg: T6High roll: T6Stable: T6Ready: 7%
The Adversary Mk. IIAct 2 · boss
200
Avg: T6High roll: T6Stable: T6Ready: 7%
Slimed BerserkerAct 2 · boss
266
Avg: Not onlineHigh roll: Not onlineStable: Not onlineReady: 0%
Mecha KnightAct 3 · boss
300
Avg: Not onlineHigh roll: Not onlineStable: Not onlineReady: 0%
The Adversary Mk. IIIAct 3 · boss
300
Avg: Not onlineHigh roll: Not onlineStable: Not onlineReady: 0%
The InsatiableAct 3 · boss
321
Avg: Not onlineHigh roll: Not onlineStable: Not onlineReady: 0%
Knowledge DemonAct 1 · boss
379
Avg: Not onlineHigh roll: Not onlineStable: Not onlineReady: 0%
The QueenAct 3 · boss
400
Avg: Not onlineHigh roll: Not onlineStable: Not onlineReady: 0%
DoormakerAct 1 · boss
489
Avg: Not onlineHigh roll: Not onlineStable: Not onlineReady: 0%
Model Notes
Sequencing is explicit
The simulator prioritizes Haunt, Soul cycling, fixed Soul setup, and then No Escape. It is a transparent priority rule, not a fake perfect-play oracle.
Pressure means Doom plus chip
Execute checks care about current HP. That means Haunt triggers, Capture Spirit, Reave, and Severance all lower the threshold you need to cross.
Deck size still matters
A shell with the right pieces can still whiff if it is stuffed with filler. This page samples different draw orders so the miss rate shows up instead of being hand-waved away.
