Cleric/Divine, Level 20
Duration: Permanent until overwritten by this spell or overridden by the target's volition (see below)
Range: Infinite within plane
Enchant an individual with an aura of, and variably strong inclinations to follow behaviors circumscribed by, an Alignment of Law, Chaos, or Neutrality, and (optionally) fluency in a language known only by others of the same Alignment.
The individual may at times act against those circumscriptions, but in extreme circumstances may be compelled after an introspective struggle (roll under WIS/CHA or save vs magic, etc).
After a series of such struggles, their Alignment may change toward that associated with the individual's actions.
Conceptual Status: Warning - Notional Idea
Alignment is a perennially debated topic, but I was struck by the notion of looking at it from a different perspective. If magic exists, perhaps Alignment could be tied to the effect of a spell, like a cosmic-level "Charm Person". This explains both its ability to be "detected" and other mechanical interactions, while leaning into, instead of dodging the fact that it feels "artificial".