What does protection from white mean?
Archon of Absolution has protection from white, so nobody can cast a white spell that targets it. Similarly, white creatures can’t block it or target it with their abilities. No white source can deal it damage.
What color do you wear for protection?
Black. Black is the color of protection, banishing, grounding, and safety.
What is protection from black?
Protection from Black helps against four things: prevent all damage from black sources; can’t have black enchantments or equipment attached to it; can’t be blocked by black creatures; and can’t be targeted by black spells or abilities of black sources (commonly collected under the acronym of DEBT.)