Trent, Sixth Session:
CANON XXXIII.-If any one saith, that, by the Catholic doctrine touching Justification, by this holy Synod inset forth in this present decree, the glory of God, or the merits of our Lord Jesus Christ are in any way derogated from, and not rather that the truth of our faith, and the glory in fine of God and of Jesus Christ are rendered (more) illustrious; let him be anathema.Perhaps it is only me, but it seems to me that the folks at Trent realized that what they were doing was dishonoring to God and to the glory of the merits of Christ. Canon 33 is the sort of canon that does not help to define dogma but is instead a sort of "shut up and don't criticize us." It is totally superfluous to the other canons. After all, one could not very well both accept Trent's teaching and simultaneously claim that the glory of God or the merits of Jesus Christ are derogated from by them.
In short, I think one would have to strain to find any positive value to this sort of canon. Instead, it seems that the denial of sola fide found in Trent was sufficiently plainly derogatory to the glory of God and the merits of Christ that they realized folks would criticize them along these lines. Accordingly, they have provided this canon as the final canon of the set to attempt to silence criticism. It does not address a heresy