9 Kings: Rainbow Dragon King Build Guide for Update 0.9

To run a successful Rainbow Dragon build with the Dragon King in 9 Kings Update 0.9, draft four distinct elemental drake variants, prioritize perk nodes that multiply debuff damage, and stagger your dragons across the front rows to funnel enemies into overlapping breath cones.

The Dragon King relies on high-health frontline units with innate cleave rather than wide summon swarms. In Update 0.9, dedicated unit-tag perks allow individual dragons to scale significantly through elemental interactions. Because dragons require heavy gold investments and deployment costs, maintaining board tempo requires keeping your initial units alive while accumulating complementary elemental tags.

Core Dragon Drafting and Board Placement

Drafting a rainbow composition requires acquiring fire, frost, storm, and acid variants to trigger cross-elemental debuffs that peel enemy armor and control movement speed.

Never place your dragons in an adjacent, compact cluster. Clustered placement leaves your primary frontline vulnerable to enemy area-of-effect spells and cleaves. Stagger your heavy fire and frost drakes along the front two rows with one empty tile between them. This spacing forces incoming waves into narrow choke points where breath cones overlap, maximizing damage output per attack cycle.

Perk Prioritization

Update 0.9 introduces specific perk trees tied to unit tags. Prioritize perks that enhance status interactions over flat statistical increases like raw attack power or minor health boosts.

1. Elemental Amplification Perks: Take perks that increase damage against enemies already afflicted by elemental debuffs. Pairing burning targets with bonus electrical or physical damage produces burst damage capable of eliminating elite vanguards quickly.
2. Breath Cooldown and Surge Triggers: Pick cooldown reduction for breath skills. Surge effects trigger when units cycle abilities rapidly, enabling higher-tier drakes to output continuous elemental streams instead of relying on standard basic attacks.
3. Sustain and Leech Nodes: Select perks granting lifesteal on breath damage or passive health regeneration based on the count of active unique dragon types on your board.

Pass on generic minion perks that buff unaligned summons or increase raw board quantity. Diluting your perk pool with minor buffs for auxiliary foot units slows down the exponential scaling your dragons need against late-game bosses.

Executing Elemental Synergies

Maximize damage by sequencing debuffs before applying burst hits:

• Frost drakes apply chills to reduce enemy movement speed, forcing attacking ranks to pack together tightly.
• Fire and acid drakes apply damage-over-time stacks that peel flat defenses off the packed group.
• Storm drakes then fire chain lightning across the clustered, armor-stripped targets to clear the wave.

Check enemy resistances before merging duplicate cards. If an upcoming boss wave features high fire resistance, pause secondary fire upgrades and direct resources into upgrading your frost or storm drakes. Card fusions increase both unit stats and the area of breath cones, making a single high-tier drake more effective than multiple un-upgraded units fighting for board space.

Economy and Hazard Management

High-tier dragon runs risk card starvation if you exhaust gold too quickly. Maintain a lean deck and protect your high-value carries using these rules:

• Save a gold reserve: Avoid spending your gold down to zero on normal rounds. Maintain enough surplus funds to purchase rare dragon cards as soon as they appear in the shop.
• Remove dead weight: Use deck removal options to eliminate basic, off-synergy cards. Trimming your deck ensures higher draw consistency for dragon cards and perk-triggering spells.
• Control shop rerolls: Only spend gold on shop refreshes when your current treasury exceeds the cost of purchasing and upgrading an offered unit immediately.
• Defend against targeted spells: Late-game waves feature single-target execution spells aimed at high-health units. Pick up defensive barrier perks that activate at specific health thresholds, and place an off-tank drake slightly ahead of your primary damage carry to absorb enemy focus fire.