It is completely nonexistent during the good playthrough's endgame no matter how many are consumed and as such this ultimately feels like intentional punishment to lecture the player, rather than having an interesting consequence with an interesting impact on the story and roleplay.
My thoughts, exactly. It is the only ending with such a punishing/unwarranted check.
I would add this cannot be compared with the Emperor's "astral-touched" tadpole resistance check (which felt right as a consequence, as it is present in all playthroughs, good or evil).
Anyway, so much hype for the all-new evil endings in patch 7... but, guess what BG3 fans, they are **soft-locked** behind a 25 constitution check if you ever used any tadpoles... and that is supposed to happen when you fully control the godlike powers of the Netherbrain... I love choices and consequences, but please Larian, that is obviously not coherent nor fun.
Let's pray to Mystra that a hotfix will soon get rid of that awful, unjustified, 25 constitution check