Perks
117 perks. King perks apply only when you play that king; universal perks work for every king; Rainbow perks change how the perk grid itself counts. Multiplayer perks are a separate set for ranked runs. How slots, ranks and king levels work.
Universal perks
Castellan
Max rank 3
Base has +10% to all stats.

Expansionist
Max rank 3
Start with +1 random unlocked plot.

Fortifier
Max rank 3
Towers start with +10% damage.
Holy
Max rank 3
Doubles blessing effect.

Ingenious
Max rank 2
Your base can now level up +3 times.

Lucky
Max rank 3
Rainbow cards are +20% more likely to appear in shops.

Nurturer
Max rank 3
All troops start with +10% HP.

Persistent
Max rank 3
Start with +2 free re-rolls.

Politician
Max rank 2
+1 royal decree option.
Scavenger
Max rank 3
Your kingdom starts with treasure chests.
Swift
Max rank 3
All troops have extra attack speed.
Wrathful
Max rank 3
All troops deal +10% damage.
Thorough
Max rank 3
Get +1 random card from your king in year 33.
Entrepreneur
Max rank 3
Gain gold after every battle.
Resilient
Max rank 3
Start with +1 life.
Quick
Max rank 3
Plots start with extra movement speed.
Elevated
Max rank 3
All summons start +10% stronger.
Prodigious
Max rank 3
Cards you place after your opening play level up immediately.
King of Nothing

Agricultural
Max rank 3
Start with Farm cards in your hand.
Benevolent
Max rank 3
Gives you +1 Wildcard after every Rainbow Army battle.

Farsighted
Max rank 3
Archers have +50% range.

Mauler
Max rank 3
Castle boulders start with a larger attack area.

Protector
Max rank 3
Troops start with Steel Coat stacks.

Recruiter
Max rank 3
Soldiers start with a bonus to all stats.

Sentinel
Max rank 3
Scout Towers start with extra arrows.

Stubborn
Max rank 3
Start with free re-rolls.

Valiant
Max rank 3
Paladins start with extra units.
King of Spells

Arcane
Max rank 3
Wizards gain +1% damage for every Enchantment they bear.

Eldritch
Max rank 3
Shamans deal +20% damage.

Electric
Max rank 3
Static causes +3 damage.

Mystic
Max rank 3
Start with +1 completely random enchantment in hand.

Ruthless
Max rank 3
Citadel attack has a 5% chance to insta-kill.

Scholar
Max rank 1
Raises the Library success rate.

Scrollmaster
Max rank 3
Start with completely random tome cards in hand.

Seer
Max rank 3
Spires start with extra rays.

Sorcerous
Max rank 3
Warlocks gain +1% HP for every Tome used.
King of Greed

Fixer
Max rank 3
Dispensers start with extra damage.

Goon
Max rank 3
Thieves deal extra critical damage.

Nepobaby
Max rank 3
Start with +20 gold.

Oligarch
Max rank 2
Start with +1 Vault card in your hand.

Patron
Max rank 3
Over-invest gives a bonus to all stats.

Peddler
Max rank 3
1 free shop purchase.

Planner
Max rank 3
Losing a life gives you +30 gold.

Smuggler
Max rank 3
Mortgage gives extra gold.

Tycoon
Max rank 3
Mercenaries cost less gold.
King of Blood

Blighted
Max rank 3

Butcher
Max rank 3
Manglers get extra damage per sacrificed unit.

Cultist
Max rank 3
Start with +1 Imp card in hand.

Diabolical
Max rank 3
Pagoda starts summoning +9 Ghosts.

Explosive
Max rank 3
Bombers start with +3 units.

Martyr
Max rank 3
Carnage has a larger attack area.
Oracle
Max rank 3
Oblation starts with extra effect stacks.

Pagan
Max rank 2
Start with a Demon Altar in a random corner plot.

Summoner
Max rank 3
All summons start with a bonus to all stats.
King of Nature

Ecofriendly
Max rank 3
Start with +1 Forest card in your hand.

Elven
Max rank 3
Elves start with +20% damage.

Gardener
Max rank 3
Orchard casts +1 root per plot level.

Healer
Max rank 3
Treant starts with +10% damage.

Pollinator
Max rank 3
Start with a Mycelium in a random outer plot.

Spreader
Max rank 3
All Nature troops start with +3 units.

Tamer
Max rank 3
Boars start with +10% HP.

Tenacious
Max rank 3
Receive +1 Procreate card every time you lose a life.

Toxic
Max rank 3
Poison ticks are +10% faster.
King of Nomads

Aggressive
Max rank 3
Swords give extra damage.

Cold
Max rank 3
Increases the Frost effect.

Defensive
Max rank 3
Shields give extra HP.

Immigrant
Max rank 3
Gives you a Migration card at every Expansion Tower event.

Jurassic
Max rank 3
Raptors start with +20% damage.

Khan
Max rank 3
Warlord starts with a bonus to all stats.

Leader
Max rank 3
Start with random troop cards in your hand.

Rebellious
Max rank 3
Mob plots get +1 unit every year.

Reptilian
Max rank 3
Dragon Dens get +3% buff for every destruction effect.
King of Stone

Ballisteer
Max rank 3
Ballistas start with extra units.

Brewer
Max rank 3
Cauldrons start with extra poison stacks.

Hunter
Max rank 3
Trapper's traps now stun +50% longer.

Hurler
Max rank 3
Trebuchets start throwing extra rocks.

Impervious
Max rank 3
Losing a life gives you +2 Wallmaker cards.

Incendiary
Max rank 3
Flametowers start with a larger attack area.

Sturdy
Max rank 3
Walls start with extra HP.

Tactician
Max rank 2
Start with +1 completely random tower card in hand.

Warden
Max rank 2
Stronghold starts with +1 level.
King of Progress

Admiral
Max rank 3
Mothership's movement and attack speed are increased by 10%.

Armored
Max rank 3
Defenders start with extra HP.

Innovator
Max rank 2
Start with +1 Concabulator card in hand.

Mad
Max rank 3
Converters start with extra attack speed.

Opportunist
Max rank 3
Gives you +5 gold for each level up.

Progressive
Max rank 3
All Progress cards can level up extra times.

Ranger
Max rank 3
Executioners start with extra damage.

Scientific
Max rank 3
Lab Rats start with extra levels.
Trashy
Max rank 3
Whenever a Recycler is placed on a plot, adds +1 Trash card to your hand
King of Time

Agile
Max rank 3
All plots start with extra movement speed.

Brutal
Max rank 3
Your troops start with +1 Adrenaline stack.

Destructive
Max rank 3
Orbiters start with +40% damage.

Exiler
Max rank 3
Bastion attacks warp enemies +1 time.

Horologist
Max rank 3
Hourglass attacks start faster.

Invoker
Max rank 3
Warpers' summons have more HP.

Manipulative
Max rank 3
Enemies have reduced attack speed.

Physicist
Max rank 3
Start with Portal cards.

Wise
Max rank 3
Gives a bonus to all stats of all plots per year played.
Rainbow perks
Banisher
Max rank 3
Allows you to pick a king to banish from the next run.
Expander
Max rank 3
Adds perk slots to one row.
Leftist
Max rank 3
The perk to its left is applied extra times.
Lunatic
Max rank 3
If this is your only perk, you start at war against the Jack of Rainbows.
Moderate
Max rank 3
All universal perks are applied a fixed number of times, no more and no less.
Nationalist
Max rank 3
All adjacent king perks are applied +1 time.
Seasoned
Max rank 3
Grants you experience.
Verticalist
Max rank 3
Vertically adjacent perks are applied extra times.
Authoritarian
Max rank 3
The top-left regular perk is applied a fixed number of times (x3 per Patch #30), no more and no less.
Multiplayer perks
Hardy
Max rank 3
Increases your base's HP by +20%.
Leftist
Max rank 3
The perk to its left is applied +1 time.
Expander
Max rank 3
Adds 2 perk slots to one row.
Verticalist
Max rank 3
Vertically adjacent perks are applied +1 time.
Moderate
Max rank 3
All universal perks are now x2. No more, no less.
Vigilant
Max rank 3
Starts with +2 years of protection.
Authoritarian
Max rank 3
The top-left regular perk is applied a fixed number of times (x3 per Patch #30), no more and no less.
Vain
Max rank 3
Gains medals after runs.
Ambitious
Max rank 3
Gains rank points if you finish a run in first place.
Source: perk table from the 1.0 game data on the official 9 Kings wiki. Values per rank come from the Patch #30 and #31 notes or the official wiki perk table; where neither states a number, the effect is described without one.
