Crayon (Special Property)

"These undesirable manifestations of paper and wax... attempt to exploit your childhood familiarity... come from the being they call the Lucky Ducky... immune to almost everything we've got, even bloontonium... why, just why..."

- -Agent Five Crayon Bloons are crayon-shaped "bloons" that exclusively appear in boss fights against the Lucky Ducky and various advanced special missions. Unlike other special properties, the crayon property can apply to every bloon in the game, even M.O.A.B.-class bloons. Crayon Bloons have the special immunity of every damage type that exists in the game, besides fire (e.g. Ring of Fire, Dragon's Breath, Blazing Boomerangs, Burny Stuff, etc.) and heated attacks (e.g. White Hot Spikes, Heat-Tipped Darts, Hot Shot Tacks, etc.). Upgrades with these damage types are often expensive, and thus make defending against bloons of this special property very difficult. M.O.A.B.-Class Bloons of the Crayon property are instead portrayed to be crayon boxes.

Strategy
The player's only orthodox method of popping Crayon Bloons is to use fire-based or heated attacks. Often, these types of attacks are usually rather expensive or costly and thus may prove to be inefficient against Lucky Ducky's boss battle; further increasing the difficulty of a boss battle that includes lots of mass stunning of towers, unwanted selling of towers, and other frustratingly inconvenient methods of disabling or displacing one's towers. Thus, using Convert-A-Trons to effectively transform all projectiles nearby into their fiery forms can bypass high costs in an efficient manner.

Orange Crayon Bloons (Orange Bloons with the Crayon Property) are special due to the fact that they are immune to fire, along with pretty much everything else. Heated attacks are the player's only hope against Orange Crayon Bloons, as even corrosive and bloontonium-based attacks cannot hurt Crayon Bloons.

Trivia

 * Despite what it may seem, this is not a joke conception; rather, this is a branch-off conception from an ascended joke conception.
 * This is Shiverpeace's first special property.