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Vantom and Kaiser Crab: prepare for their mechanics

Quick answer

Vantom rewards many damage instances before a large finisher. Kaiser Crab requires you to control which claw you face when ending the turn. Read live intents for your difficulty and party size.

How this guide was checked

Coverage: Early Access · Main 0.107.1 · optional Beta 0.111.0 · next beta planned November 12 · official sources checked November 4, 2026 UTC. Research checked 8 Oct 2026. Updated 25 Oct 2026

This guide uses the linked sources and any attributed demonstrations. Platform differences and limitations are noted with the advice they affect.

See the 3 sources
3 sources
Creator clipChecked on screen · 25 Oct 20263 steps2 moments · 0:47
  1. 0:04–0:35Vantom's Slippery counter falling as small hits landStrip Vantom’s Slippery efficiently · Sir Redbeard
  2. 0:08–0:24Kaiser Crab's two claws, Back Attack and Crab RageEnd facing the claw that threatens you most · Sir Redbeard

See it first · Strip Vantom’s Slippery efficiently ↓

Checked on screen · Oct 25, 2026

0:04–0:35 · 31 sVantom's Slippery counter falling as small hits land
Sir RedbeardFull video ↗
Credits

“Slay the Spire 2 - Defect vs Vantom (Act 1 Boss - Heavy Attack deck 1/2 )” by Sir Redbeard · Jul 31, 2026 · Uploaded July 31, 2026, after Main 0.107.1; the version text in the corner is too small to read

Independent creator · no partnership implied

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Before you start

  • This page covers tactics, not a verified move-by-move table for every Ascension.
  • Launch-era guides are cross-checked against official changes; use current tooltips for numbers.
1

Strip Vantom’s Slippery efficiently

Slippery reduces incoming damage instances while its stacks remain. Use cheap or multi-hit attacks to remove stacks before committing a large hit. Twin Strike is one published example. Keep watching the rising attack pressure and Wounds entering the deck.

The launch guide reports nine starting stacks in standard solo play. Co-op scaling changed in Main 0.107.1, so this wiki does not use nine as a universal value. Read the counter in your fight.

Checked on screen · Oct 25, 2026

0:04–0:35 · 31 sVantom's Slippery counter falling as small hits land

Before your big hits, hover Vantom and read the Slippery count, then spend cheap hits on it: each one only takes 1 HP but removes a stack, as the count falls from 8 to 5 here.

Sir RedbeardFull video ↗
Credits

“Slay the Spire 2 - Defect vs Vantom (Act 1 Boss - Heavy Attack deck 1/2 )” by Sir Redbeard · Jul 31, 2026 · Uploaded July 31, 2026, after Main 0.107.1; the version text in the corner is too small to read

Independent creator · no partnership implied

Creator? Ask us to remove this

0:04–0:35Vantom's Slippery counter falling as small hits land
Sources for this section
2

End facing the claw that threatens you most

Kaiser Crab places a claw on each side. Surround makes a hit from behind more dangerous. Save a targeted action that lets you finish facing the heavy attacker, even if earlier attacks focused the opposite claw.

Kingy turn plan: identify the larger displayed attack, choose your damage target, then reserve the final targeting action before spending all Energy. Recheck facing and both intents before ending. When one claw falls, the other gains a large defensive buffer; avoid assuming the first kill ends the fight.

Checked on screen · Oct 25, 2026

0:08–0:24 · 16 sKaiser Crab's two claws, Back Attack and Crab Rage

At the start of the fight, compare both claws' attack numbers and read Back Attack before choosing a target. Crab Rage warns that killing one claw gives the other 6 Strength and 99 Block.

Sir RedbeardFull video ↗
Credits

“Slay the Spire 2 - Ironclad vs Kaiser Crab (Act 2 Boss - Vulnerable deck 1/2 )” by Sir Redbeard · Aug 23, 2026 · Uploaded Aug 23, 2026, after Main 0.107.1; build not readable on screen

Independent creator · no partnership implied

Creator? Ask us to remove this

0:08–0:24Kaiser Crab's two claws, Back Attack and Crab Rage
Sources for this section
3

Why an old Doormaker route may not match

Major Update #2 removed Doormaker and introduced Aeonglass. A walkthrough that still treats Doormaker as a current encounter is using older content. The complete current boss roster and tested high-Ascension move tables remain on the expansion list.

Sources for this section

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Sources · 3Official · Walkthrough · checked 8 Oct 2026 · Research checked 8 Oct 2026
Major Update #2 - v0.107.1 ↗Main branch: Workshop, RNG, Bestiary, Aeonglass, Pumpkin Candle duration and Kindle. Full patch text rechecked in the official Steam feed; no later Main patch was listed on October 8, 2026.Official ·
How to beat Vantom ↗Slippery and hit-count tactics; launch-era damage values not reused.Walkthrough ·
Kaiser Crab boss guide ↗Surround and facing; historical numeric attack table not reused.Walkthrough ·

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