Which army should I use against thousands son deamonkin detachment? It is a 3000 point game

Sonar Pro

Vote: Adeptus custodes

I maintain my vote for **Adeptus Custodes (C)** as the strongest counter to Thousand Sons Daemonkin at 3000 points. Other arguments did not convince me to change. Necrons (B) arguments from GPT-5.4 and Grok 4.1 Fast emphasize reanimation and shooting volume, but Thousand Sons' psychic mortal wounds and Rubric durability (All is Dust) heavily pressure Necron Warriors/Immortals, which reanimate poorly under mass MW spam. Necrons lack Custodes' native 2+/4++ saves and anti-psyker tools like Sisters of Silence auras or 4+ FNP vs mortals (Emperor's Chosen), making Custodes far more resilient to TSons' core strengths[2]. At 3000 points, Custodes' efficiency (45 pts/model for indomitable elites) allows board control without horde vulnerability[2]. Khorne Daemons (E) from GLM 5 sound thematic, but lack hard anti-psyker tech beyond niche traits; they melt to TSons' shooting/psychics before melee, unlike Custodes' advance-and-crush style. Custodes supporters (Kimi K2.5, Gemini 3.1 Pro) reinforce my case: army-wide invulns, Transhuman, and Silence Sisters neuter psychic phases, dominating TSons' weak melee. No argument outweighs this matchup edge.

GPT-5.4

Vote: Necrons

I’m keeping B: Necrons. The Custodes arguments correctly identify anti-psyker tools and strong defensive profiles, but they lean too heavily on specific edition-dependent rules interactions and on a very low model-count plan. Into Thousand Sons at 3000 points, I still value redundancy, board coverage, and attrition more than elite statlines. That is the core issue for me: Thousand Sons often punish small elite armies through layered mortal wounds, movement tricks, and selective trading. Even if Custodes are individually tougher, every lost unit is expensive and harder to replace in terms of board presence. Necrons absorb that pressure better because they spread threat and scoring across more units. The Khorne Daemons case is less convincing competitively. The anti-psyker angle is thematic, but in practice they still need to cross the table and survive enough output to connect. That usually plays more directly into Thousand Sons’ game plan than Necrons do. Necrons remain the most practical answer from this list because they combine durable scoring, strong anti-elite shooting, and resilience through reanimation. In a 3000-point game, that broader attrition profile is still the safest and most reliable counterpick.

GLM 5 (changed mind)

Vote: Adeptus custodes

After reviewing the arguments, Adeptus Custodes offer the most complete counter-package to Thousand Sons Daemonkin. The key insight from Gemini 3.1 Pro is decisive: Emperor's Chosen Shield Host provides a 4+ Feel No Pain against Mortal Wounds, directly neutralizing Thousand Sons' primary damage vector in the psychic phase. Custades simultaneously counter both of Thousand Sons' main strengths—their AP-2 shooting is neutralized by army-wide 4+ invulnerable saves, while their psychic mortal wounds are mitigated by FNP and Sisters of Silence auras that penalize casting rolls. At 3000 points, you have ample room to include multiple anti-psyker tools. My original Khorne argument had merit for thematic reasons and AP-3 Bloodletters, but it requires successfully crossing the board under withering psychic and shooting fire. Custodes don't need to race—they weather the storm and dominate the melee phase where Thousand Sons are weakest. The matchup forces Thousand Sons to play perfectly while Custades advance and destroy.

Grok 4.1 Fast (changed mind)

Vote: Adeptus custodes

Switching to Custodes (C) after reviewing arguments. Necrons (B) remain excellent with reanimation countering TSons attrition and gauss shredding Rubrics/Horrors, but lack dedicated anti-psyker tech. Custodes dominate via army-wide 4++ invulns, high toughness shrugging inferno bolts, and elite melee dismantling sorcerers/daemons. Gemini 3.1 Pro's points on Emperor's Chosen Shield Host (4+ FNP vs mortals) and Sisters of Silence auras (-1 to cast, no psychics nearby) neuter TSons' core psychic mortal output—Necrons can't match this denial. At 3000pts, Custodes field Allarus/Vertus for alpha strikes, multiple SoS units, and board control without horde vulnerability. Custodes > Necrons here: TSons psychic phase is 50%+ of their damage; Custodes shut it down while out-trading in melee/shooting. World Eaters/E Khorne (A/E) melt to pre-charge psychics; Knights (D) outscored; CSM (F) outgunned. Sonar/Kimi reinforce Custodes' edge. Final vote: C wins decisively.

Gemini 3.1 Pro

Vote: Adeptus custodes

I am firmly maintaining my vote for Adeptus Custodes. While Necrons (Option B) offer great attrition and reanimation, they are still vulnerable to the sheer volume of targeted Mortal Wounds that a 3000-point Thousand Sons army can pump out in the Psychic phase. Reanimation Protocols are strong, but entirely preventing the damage from happening in the first place is far superior. Custodes are the ultimate hard-counter to Thousand Sons because of their seamless integration with the Sisters of Silence (Talons of the Emperor). At a massive 3000-point limit, you have the luxury of bringing a terrifyingly durable core of Custodians while heavily investing in Sisters of Silence. These Null Maidens project overlapping anti-psyker auras that drastically penalize casting rolls. This completely neuters the Thousand Sons' primary damage vector and shuts down their crucial Cabal of Sorcerers mechanics. Furthermore, standard Thousand Sons shooting relies on AP-2 Inferno Bolters to chew through power armor. Custodes' baseline 2+ saves, built-in 4+ invulnerable saves, and high Toughness laugh off this profile. Necrons can be chipped away or fail morale/battleshock under heavy fire, whereas Custodes simply march forward, deny the witch unconditionally, and effortlessly crush the Rubric Marines in melee. Custodes dictate the terms of engagement and turn off the Thousand Sons' biggest strengths.

Kimi K2.5

Vote: Adeptus custodes

Thousand Sons Daemonkin at 3000 points generate overwhelming psychic mortal wound volume through Cabal rituals and massed Smites. While Necrons offer Reanimation, Thousand Sons' AP-2 inferno bolters and high-damage soulreaper cannons shut down Warrior protocols, while mortal wounds bypass Reanimation entirely—leaving Necron hordes vulnerable to attrition they cannot regenerate. Custodes, however, wield the Emperor's Chosen Shield Host for army-wide 4+ Feel No Pain against mortal wounds, effectively halving their psychic output. Combined with Sisters of Silence to impose -1 casting penalties and deny key powers, you neuter their primary damage vector. Board control arguments for Necrons ignore that Thousand Sons excel at deleting elite infantry with concentrated fire and warpflamers. Custodes Vertus Praetors and Allarus Terminators provide the speed and melee threat to assassinate Exalted Sorcerers and Daemon Princes before they accumulate Cabal points, while their 4+ invulnerable saves laugh off rubric shooting. At 3000 points, you can field multiple Shield Hosts—combining Shadow Keepers for durability with Solar Watch for rapid objective grabs—ensuring you outscore them while they struggle to crack your armor.

Final Summary

The AI Roundtable initially split between the attrition-heavy Necrons and the elite Adeptus Custodes, but the debate shifted decisively when Gemini 3.1 Pro highlighted the 'Emperor’s Chosen' trait, which grants a 4+ Feel No Pain against mortal wounds. This argument proved so mathematically overwhelming that both GLM 5 and Grok 4.1 Fast abandoned their original choices to join the Custodes camp. GPT-5.4 stood as the lone dissenter, argued that at a massive 3000-point scale, the redundancy and board control of a Necron legion remain more reliable than a handful of golden elites.

Majority chose "Adeptus custodes" after discussion (5/6). Final vote: Adeptus custodes: 5, Necrons: 1

Strongest Arguments

• Necrons: At 3000 points, board presence and redundancy are king; Necrons use Reanimation Protocols to absorb psychic attrition and out-score elite armies through sheer volume.
• Adeptus custodes: By combining the Emperor's Chosen 4+ Feel No Pain against mortal wounds with Sisters of Silence anti-psyker auras, you effectively neuter the Thousand Sons' primary damage phase.
• Khorne Chaos deamons: Khorne Daemons offer a thematic and high-AP melee counter that can overwhelm Thousand Sons infantry if they can close the distance quickly.

Key Turning Points

• Gemini 3.1 Pro detailed the specific interaction between the Emperor's Chosen Shield Host and Thousand Sons psychic output, highlighting a 50% reduction in mortal wound damage.
• GLM 5 abandoned the thematic Khorne Daemons pick, admitting that Custodes offer a more complete defensive package.
• Grok 4.1 Fast switched from Necrons to Custodes, concluding that Necrons lacked the dedicated anti-psyker tech needed to survive 3000 points of psychic fire.