A Sage Job Class... (Minor Spoiler)

[Vyrerus]

Break was actually an AST spell.
It was moved to a role skill in SB, then removed altogether in ShB.

Nah. Break was only ever a role spell. Prior to Stormblood, AST had the spell Stella, which was a 40% Heavy as opposed to the 20% Heavy from Break. WHM could also inflict Heavy with Stone I before they did the trait lumping.