I thought he said he would lower the base to account for adding the spell level? So it would be something like 5 + ability mod + slot level.
so a level 1 caster with 18 mod would have a save DC of 10 (5+4+1) while a 20th level caster would have a save DC of 20 (5+6+9). This keeps it within...
What happened to the idea of effects limited by HP threshold that was being discussed? Leave the saves the same but scale down the effect as PCs grow in level ( and HP). So under 25 HP would get 1 save and be paralyzed if they failed. Under 50 HP would get two saves , failing the first would...