Every magic spell has an aura comprised of colors that can be seen by those with the right senses. The color of magic speaks volumes about how the spell works, as each color corresponds to a different aspect of reality. Fey warlocks can produce pure colors that produce magical effects, inverting the normal relationship between color and magic.
Color
Aspect
Red
Physical matter, energy, and forces
Green
Growth, healing, evolution
Blue
Order, structure, defense
Yellow
Change, entropy, transmutation
Magenta
Planes, teleportation
Cyan
The mind, astral constructs, psychic phenomena
Black
Negative energy
White
Arcane energy
Ranks
Your palette expands with rank:
Rank
Colors
1
Red, Green, Blue
2
Cyan, Magenta, Yellow
3
White, Black
4
Prismatic (multiple colors at once)
At low rank, colors tend to be random. At mid rank, you can choose a color. At the highest ranks, you can use multiple colors at a time (prismatic effects).