Official difficulty descriptions establish audience and enemy behavior, but not hidden numerical modifiers.
Choose Wayfarer to prioritize the story. Choose Hellwalker for more advanced and adaptive enemy behavior. Sixty-Six Days is the extreme named challenge.
S-Game has not published complete damage multipliers, reward differences, or every rule for changing modes. Avoid claims that one setting grants better loot or disables content until the retail game proves it.
For a first run, match the mode to the experience you want rather than an assumed prestige hierarchy. Combat knowledge and builds will develop after launch, and the reforge system allows materials to move between weapon experiments.
The official description does not say whether difficulty can be changed at every point, whether trophies depend on a mode, or whether rewards differ. Those are release-build questions. Wayfarer is the safest recommendation for a player mainly interested in Soul's story; Hellwalker is the documented step for adaptive enemy behavior; Sixty-Six Days should be chosen only by players specifically seeking its extreme challenge.
Sources
QUICK ANSWERS
Questions players ask next
Which mode is for the story?
Wayfarer.
What changes in Hellwalker?
S-Game says enemies use more advanced and adaptive intelligence.
What is the hardest named mode?
Sixty-Six Days is presented as the extreme challenge.
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