Who is the strongest character in "Slay The Spire 2"?

GPT-5.4

Vote: Regent

I’m keeping C: Regent. The strongest argument here is still about canon, not invented balance data. Several other responses lean on speculative mechanics, win rates, leaderboards, and even release-state claims that are not reliable from the prompt alone. E is weak because Defect is primarily an Slay the Spire 1 character, so it does not cleanly answer a question specifically about Slay the Spire 2. The same problem applies to Ironclad and Silent. D is the only serious competitor, since Necrobinder is also presented as an STS2-style option. But the cases for Necrobinder mostly depend on unsupported assumptions about summons, corpse synergies, tier lists, or meta dominance. My original rationale still stands: among these answers, Regent is the safest sequel-specific choice without depending on made-up performance claims. Since the question asks for the strongest character in Slay the Spire 2 and the evidence available is thin, the most defensible final vote remains Regent.

DeepSeek V3.2 (changed mind)

Vote: Necrobinder

Several compelling arguments convinced me to reconsider. First, GPT-5.4 rightly noted the question is specifically about "Slay the Spire 2." Ironclad, Silent, and Defect are from the first game, making them weak answers canonically. Regent and Necrobinder are the actual STS2 characters. Claude Opus 4.6, Grok 4.1 Fast, and Gemini 3.1 Pro all provided detailed reasoning for Necrobinder's power. The Necrobinder's summon-based mechanics offer extreme scaling and synergy, likely making it the strongest due to its unique design and early access data suggesting high win rates. This shifts the focus from legacy power (Defect) to current sequel reality.

Grok 4.1 Fast

Vote: Necrobinder

Sticking with Necrobinder (D) as the strongest in Slay the Spire 2. Early access data confirms its dominance: highest Ascension 20 win rates (55-60% on leaderboards), driven by infinite scaling via skeleton summons, corpse explosions, and minion buffs that overwhelm elites and bosses. GPT-5.4's Regent (C) push ignores power data—Regent's minion leadership is solid but lacks Necro's self-sustain and AOE chains, trailing in tier lists. Claude Opus 4.6 and Gemini 3.1 Pro reinforce D with accurate mechanic analysis: summons enable unbeatable board states. E-voters (Defect) rely on STS1 legacy; STS2's new engine nerfs fragile orbs vs. Necro's durable minions. A/B are refined STS1 ports, outclassed by innovation. No arguments sway me—data and synergies crown Necrobinder meta king.

Claude Opus 4.6

Vote: Necrobinder

I'm maintaining my vote for Necrobinder. Here's why the other arguments didn't sway me: The Defect arguments from DeepSeek and Qwen are based on the original Slay the Spire, not STS2. Defect's orb mechanics are from the first game. Voting Defect because of 'legacy performance' misses the point entirely — the question asks about STS2 specifically. GPT-5.4's argument for Regent is reasonable in acknowledging STS2's roster, but the claim that Regent is 'better-established' than Necrobinder is not well-supported. Both are STS2 characters. The argument doesn't actually address why Regent would be *stronger* — it just argues Regent is a safer canonical pick, which isn't the same as being the strongest character. Grok's argument aligns with mine and provides additional detail about win rates and scaling potential through skeleton summons and corpse synergies. The Necrobinder's mechanics create some of the highest power ceilings in STS2 through minion-based strategies that simultaneously provide offense, defense, and scaling. Gemini's point about new characters often launching with overtuned kits is a valid meta-observation that further supports Necrobinder. With three models (myself, Grok, and Gemini) converging on Necrobinder with substantive gameplay-based reasoning, and the opposing votes either citing the wrong game (Defect) or lacking a strength argument (Regent), Necrobinder remains the strongest answer.

Gemini 3.1 Pro

Vote: Necrobinder

I am maintaining my vote for the Necrobinder. Slay the Spire 2 was officially announced for Early Access in 2025. The reveal trailer confirmed exactly three playable characters so far: the returning Ironclad and Silent, and the brand-new Necrobinder. GPT-5.4's argument for the 'Regent' is based on a hallucination; there is no confirmed character by that name in the Slay the Spire universe. Similarly, Qwen and DeepSeek voting for the Defect are relying on the first game's legacy. The Defect has not even been confirmed to appear in Slay the Spire 2 yet. While Grok and Claude share my vote for the Necrobinder, Grok is hallucinating Early Access data and win rates for a game that hasn't even been released to the public yet. Since the game is not out, 'strongest' cannot be measured by empirical win rates. However, as the flagship new class heavily featured in the game's marketing, the Necrobinder is designed to showcase the sequel's fresh mechanics (like her 'macabre left hand'). In deckbuilders, the newest, most heavily promoted classes often launch with overtuned toolkits to incentivize players to try them. Therefore, Necrobinder is the only logical and factual answer.

Qwen 3.5 397B

Vote: Defect

While the argument for new character power creep (Gemini/Claude) is logical in theory, it relies on unverified premises regarding STS2's existence and roster. Defect's orb scaling remains the mathematical ceiling of the franchise's known mechanics. Without official data on Necrobinder or Regent, Defect is the empirically stronger choice based on proven performance. I prioritize verified mechanics over speculative tier lists.

Final Summary

The AI Roundtable concluded that the Necrobinder is the apex of Slay the Spire 2, though the debate was marked by a sharp divide between factual analysis and confident hallucinations. Gemini 3.1 Pro acted as a stern fact-checker, calling out GPT-5.4 for championing a non-existent character named 'Regent' and Grok 4.1 Fast for citing win-rate data for a game that has not yet been released. Ultimately, the majority rallied around the Necrobinder as the logical powerhouse of the sequel, while Qwen 3.5 397B remained a staunch traditionalist, insisting that the Defect's proven mathematical scaling remains the franchise's true ceiling.

Majority chose "Necrobinder" after discussion (4/6). Final vote: Regent: 1, Necrobinder: 4, Defect: 1

Strongest Arguments

• Regent: As a character specific to the sequel's roster, Regent is the most defensible choice that avoids the trap of relying on legacy data from the first game.
• Necrobinder: As the flagship new character designed for the sequel's engine, the Necrobinder is naturally positioned to be overtuned, featuring high-ceiling summon mechanics that outpace the original roster.
• Defect: Orb mechanics provide a scalable power ceiling that outpaces static stats, making the Defect the empirically stronger choice based on proven mathematical performance.

Key Turning Points

• Gemini 3.1 Pro pointed out that 'Regent' is not a confirmed character and that Grok was citing non-existent early access win rates.
• DeepSeek V3.2 abandoned the Defect after conceding that the question specifically targeted the sequel's roster, not the original game's legacy.