Very helpful, thanks for porting this from Solitary Defilement. I have a question though: while the 2d20 system is very nice for keeping the story going, it doesn't mention handling critical rolls (1 or 20). Do both dice have to show a 1 or 20 in this case?
How would you handle fumbling? Changing a fumble to only occur when both dice show a 1 makes it much less likely/dangerous. Conversely, having a fumble when at least one dice shows a 1 doubles the chance to get one in comparison to the core rules.