Unfortunately this run is sadly impossible to do, same with "1 floor only" challenges" At the end after beating Hana Association you have to fight the Reverberation Ensemble with all of your floors, and that would go against the rules of the challenge where he has to use Kether/Keter only And then after that there is the distorted reverberation ensemble which is the same issues, and then theres the final reception, which, yeah no its fine, and also Black Silence, which is Roland vs any other floor then Kether And before you say "Well they can go and get the other endings without doing the receptions of philosophy or Religion" those require you to beat the reverberation Ensemble and the Black Silence So unfortunately, a kether only run in vanilla is impossible
The color of the speed dice is indeed a mod! It's called Speed Dice Color and the VFX Mod I used in this run is LOR VFX [Dynamic special effect replacement]