The Chromatic Domains
All creatures with Purple in their Color composition have the potential to be chromatic, but it takes Color training to use these abilities to full effect. A creature with Color training is called a chromat.
Effects of Color Training
A person’s Color spread is typically a good indicator of their personality or behavior, but is not the cause for the decisions they make. It gives some pointer to their tendencies, but no more. The more noticeable effects come from chromacy. For example, the more trained a creature is in their primary Color, the more their eyes come to reflect it. Creatures have silver eyes at birth, and their eyes begin to fill with color as they become more powerful (with the exception of dragonborn and dragons). By the time a creature can be considered chromatic, their eyes are very obviously colored. The more attuned they become, the brighter and more vibrant the color gets. Monochromats’ eyes are both the same color; dichromats’ right eyes reflect their primary Color, and their left eyes reflect their secondary Color. Dragonborn and dragons are born with their eye colors fully developed, and their eyes match their scales rather than the Colors themselves.
When chromats deal in magic, their Color heavily influences certain spells. Some spells can have different effects depending on the Color of the caster, such as chromatic orb. Any spell that produces light is colored to match that of the primary Color of the caster. And any magically created fire is the same color as the primary Color of the caster. Dichromats seem to be able to choose between their Colors for these sorts of effects. When a chromat’s Color comes into question, this fact is frequently used as proof (though Oranges can still get around this).
As a Mechanic
Instead of choosing a background, players should choose a Color spread and a primary Color. Dichromacy must be determined upon creation. If a character chooses Color training, the following features are added:
Your Color spread determined your primary Color at birth, and chance played a role in whether you had the potential to be a dichromat. You’ve gone through Color training much like a soldier learns to use a sword, or a wizard researches spells. This training may have been in tandem with your martial training, or perhaps you came from a rich family and attended a university. You may have even unlocked the secrets on your own and without help. Whatever the case, you have the potential to master your Color, and you can be identified as a chromat.
Choosing a Color
When you were born, your Color spread and chance determined your primary Color. This is the Color you can manipulate by pursuing chromacy. Choose a primary Color: Red, Orange, Yellow, Green, Blue, Purple. This decision stands for the life of your character, and determines the effects of your Color training.
You become proficient in two skills of your choice attributed to your primary Color.
When your primary Color was decided, so was your ability to control your secondary Color. Choose between monochromacy and dichromacy.
Monochromat. Monochromats are masters of their one Color. They have a potential for growth and specification in a Color that dichromats can never match. You control your primary Color and only your primary Color. If options are given below for branching options, you always take the Monochromat option.
Dichromat. While less powerful on average than an equally-trained monochromat, dichromats utilize a versatility unique to the combination of their Colors. You control both your primary Color and your secondary Color. Choose a Color that is not your primary Color: Red, Orange, Yellow, Green, Blue, Purple. If options are given below for branching options, you always take the Dicromat option.
If you choose monochromacy, you cannot become a dichromat. If you choose dichromacy, you cannot become a monochromat.
Being trained means you have the ability to manipulate your Color. This ability is represented by a number of color points. At 1st level, your color point maximum is 1 in your primary Color, and 0 in every other Color. Every time you gain a level in any class, your color point maximum in one Color increases by 1.
You can spend these points to harness the attributes of your Color. The most well-known techniques are available to all. Some techniques are available to all Colors, and are learned during training.
When you spend a color point, it is unavailable until you finish a long rest, at the end of which you are refreshed, and regain all color points. At least half of this rest must be spent in bright light, or the entire rest in dim light.
Monochromat. The Color for which your color point maximum increases when you gain a level is always your primary Color.
Dichromat. The Color for which your color point maximum increases when you gain a level can be either your primary or secondary Color. The maximum number of color points for your primary Color must never be lower than half your total color point maximum (round up). For example, if you are a 5th level Red/Green dichromat, your Red color point maximum must be greater than or equal to 3.
If your total color point maximum is 2, you must have one point in your primary Color and one point in your secondary Color. For example, a 2nd level Red/Orange rogue cannot have two Red color points or two Orange color points, but must have one Red and one Orange color point. When that rogue levels up to the 3rd level, they will increase their Red color point maximum.
In addition, when you gain a level in any class, you may decrease your color point maximum in one Color by 1 and increase your color point maximum in another Color by 1. You may only gain color points in your primary or secondary Color, and you cannot have fewer than 0 color points in any Color.
You don’t use any particular ability for spellcasting. Instead, the Colors contribute almost limitless energy, and your ability to control that energy is reflected in the effects of a spell. When a spell refers to your spellcasting ability, refer to your Color training instead, as described here:
Color Training Ability = 10 + (2 * your proficiency bonus)
Color Training Modifier = your proficiency bonus
Spell save DC = 8 + your proficiency bonus + your Color Training modifier
Spell attack modifier = your proficiency bonus + your Color Training modifier
You can spend 1 color point before making a skill check to gain advantage on that skill check, provided that skill is attributed with the Color of the color point you spend.
When you take damage of a type that is associated with one of your Colors, you can use your reaction to spend 1 color point of the corresponding Color to gain resistance to that damage. For example, if you are a Red/Purple dichromat and you take fire damage, you can spend a Red color point to gain resistance to that fire damage.
You can spend 1 color point to cast color spray.
Additional Color Disciplines
Each Color’s unique traits can be found under their respective pages below. It is worth noting that there are certainly more techniques than what might be listed, but they may be lost to history, or only taught to members of select groups.