White World Tendency
White World Tendency has the following effects.
Decreases enemy HP, attack and defence power
Enemies drop fewer upgrade stones
Enemies drop more healing items.
Attack power is increased in Soul Form. Increases 10% at White, and 20% at Pure White. Stacks with Character Tendency
See the list of White World Tendency Events.
Black World Tendency
Black World Tendency has the following effects.
Increases enemy HP, attack and defence power
Enemies hold more Souls
Enemies are more likely to drop rare items
The Black Phantoms versions of enemies and NPCs appear in specific locations
Black Phantom versions of normal monsters have a 100% drop rate for their primary items.
Primeval Demons appear in specific locations in each world. Note that Primeval Demons will appear slightly before a world is Pure Black, so this is not a good way to judge if you have achieved Pure Black World Tendency. This demon will still be there when the world is Pure Black.
Your character's maximum HP in Soul Form is reduced.
See the list of Black World Tendency Events.