9 Kings: How to Build an Infinite Knight and Archer Army

To build an infinite Knight and Archer army in 9 Kings, draft basic Knights and Archers early, place production structures directly behind your vanguard, and secure reinforcement perks that generate units during active combat. This setup creates a self-replenishing wall of armored Knights that absorbs enemy focus while a protected backline of Archers scales physical damage output indefinitely.

Core Duplication Mechanics

The strategy pairs two foundational unit types to cover their respective weaknesses: Knights absorb frontline aggro with high base armor, while Archers provide sustained ranged physical damage from safety.

Transitioning from a standard squad into an infinite engine requires shifting from static deployments to active combat generation:

Frontline Retention: Knights engage advancing melee enemies, preventing them from crossing into your back ranks.
Mid-Combat Spawning: Production buildings like Barracks and combat-triggered reinforcement perks continuously summon fresh units into the fight.
Escalation Loop: Perks that duplicate units on deployment or spawn reinforcements when Knights take or block damage trigger more defenders as enemy pressure increases.
Backline Protection: As long as front-row units replenish faster than incoming burst damage can eliminate them, backline Archers fire uninterrupted volleys across the board.

Because hundreds of simultaneous units, attack calculations, and arrow projectiles can cause significant animation slowdown, prioritize attack speed and damage multipliers alongside unit volume to clear enemy waves quickly.

Grid Placement and Board Setup

Targeting and aggro mechanics prioritize the nearest opposing forces, making strict vertical row separation essential. Deploy your army across three distinct lines:

[ Frontline ]  [ Knight ]   [ Knight ]   [ Knight ]  <- Primary Defensive Wall
[ Midline   ]  [ Barracks ] [ Spawner ]  [ Support ] <- Protected Spawner Structures
[ Backline  ]  [ Archer ]   [ Archer ]   [ Archer ]  <- Massed Projectile DPS

Frontline: Place Knights across the entire vanguard row to establish a continuous defensive barrier that stops fast flanking units from reaching vulnerable backline tiles.
Midline: Position Barracks and spawner structures directly behind the Knights. This allows newly summoned melee troops to step immediately into the frontline without getting trapped or disrupting your ranged ranks.
Backline: Place Archers in the rear ranks to maintain maximum distance from melee attacks and sweeping enemy cleaves while preserving clear lines of sight.

Card Drafting and Deck Management

Securing spawner buildings and star-tier unit upgrades early prevents enemy stats from outpacing your base army before duplication perks come online.

Phase	Primary Draft Focus	Strategic Objective	Risk to Avoid
Early Rounds	Base Knights, Archers, basic production	Establish frontline stability and base damage	Over-drafting situational spells or expensive siege units
Mid Rounds	Barracks, Spawners, unit duplication perks	Accelerate reinforcement rates and unit mass	Diluting your deck with incompatible unit archetypes
Late Rounds	Attack speed, armor scaling, splash mitigation	Maximize projectile DPS and vanguard survival	Excessive unit volume that stalls movement or simulation

Keep your deck as thin as possible. Card bloat reduces the odds of drawing essential spawner upgrades and multiplication perks. Skip unneeded filler cards and use purge opportunities to remove obsolete utility cards, ensuring each cycle delivers stat buffs or unit generators.

Handling Area-of-Effect Counters

Massed formations struggle most against sweeping area-of-effect (AoE) magic, cleaving melee units, and long-range piercing artillery, which can wipe dense backline clusters in seconds.

To protect the army against high burst and splash damage:

Draft Defensive Perks: Select perks providing flat damage reduction, magic shields, or brief invulnerability windows upon spawning to give fresh Knights time to engage.
Prioritize Piercing Projectiles: If facing enemy kings equipped with long-range ballistas or siege engines, pick piercing upgrades for your Archers to eliminate threat backlines before artillery shells land.
Outpace Burst Damage: Maintain high reinforcement rates so sudden AoE spikes only remove frontline units temporarily before replacement waves restabilize the grid.