Each king has a level. At the end of each run it will gain experience based on the number of years played, regardless of whether the run was successful or not. After a king gains enough experience it will level up, which grants a point that can be spent to unlock or upgrade one of 9 perks. Perks are perks are permanent bonuses that apply to every run. They can be reset at any time.
[[File:Perks menu.png|400px|right|thumb|Selecting perks for the King of <span style="color:cadetblue;">'''Nothing'''</span>]] Each [[king]] has a level. At the end of each [[run]] it will gain experience based on the number of years played, regardless of whether the [[run]] was successful or not. After a [[king]] gains enough experience it will level up, which unlocks a perk that can be assigned to one of the king's 9 perk slots. Perks are permanent bonuses that apply to every [[run]]. They can be reset at any time between runs.
=== King of Nothing perks ===
There are 3 types of perks:
The following perks are available to the King of <span style="color:cadetblue;">'''Nothing'''</span>.
*Universal perks, available to all kings.
{| class="wikitable"
*King perks, available only to the chosen king.
*Rainbow perks, available to all kings and unlocked every third level.
A new perk unlocks every time a king levels up, alternating between Universal and King perks with every level up. Additionally, every third level threshold reached for the first time (level 3, level 6, level 9, etc.) unlocks a Rainbow perk.
Before starting a run, up to 9 perks can be activated by placing them in slots from the pool of unlocked perks, with the option to unlock additional slots by assigning the Rainbow perk Expander.
{{Outdated|The following info is outdated with the patch 11 overhaul and is currently being reworked}}
===Common Perks===
<tabber>
|-| Universal Perks =
The following perks are available to all Kings, with one perk from the list randomly unlocked at every level up.
The following perks are available to all Kings, with one perk from the list randomly unlocked upon reaching a level multiple of 3 (e.g. 3, 6, 9, et al).
Each king has a level. At the end of each run it will gain experience based on the number of years played, regardless of whether the run was successful or not. After a king gains enough experience it will level up, which unlocks a perk that can be assigned to one of the king's 9 perk slots. Perks are permanent bonuses that apply to every run. They can be reset at any time between runs.
There are 3 types of perks:
Universal perks, available to all kings.
King perks, available only to the chosen king.
Rainbow perks, available to all kings and unlocked every third level.
A new perk unlocks every time a king levels up, alternating between Universal and King perks with every level up. Additionally, every third level threshold reached for the first time (level 3, level 6, level 9, etc.) unlocks a Rainbow perk.
Before starting a run, up to 9 perks can be activated by placing them in slots from the pool of unlocked perks, with the option to unlock additional slots by assigning the Rainbow perk Expander.
The content below needs to be updated as it may not accurately represent what's currently in-game. The following info is outdated with the patch 11 overhaul and is currently being reworked
Common Perks
The following perks are available to all Kings, with one perk from the list randomly unlocked at every level up.
Perk
Bonus per rank
Max rank
Expansionist
Start with +1 random unlocked plot
3
Fortifier
Towers deal 10% more damage
3
Lucky
Special cards are 20% more likely to appear in shops
The following perks are available to all Kings, with one perk from the list randomly unlocked upon reaching a level multiple of 3 (e.g. 3, 6, 9, et al).