In today's daily, I got so far, and it looked like I could continue going indefinitely (you might want to ramp up the curse chests after some point to make things more difficult). I was looking for ways to intentionally finish the run. This gave me an idea: how about a level on which you need to defeat your own character. Let's say that after countless attempts to find the holy grail and after mingling with too many heretics, our noble hero lost their mind and need to be stopped. Maybe each step could deduct points instead of granting points. All boons and curses are still in effect, but the goal changes.
Additionally, one edge case: if you have red+purple wildcard ; smite and the bonus that stuns heretics when they step on purple - they cancel out. Nothing happens to the heretic when they step on red (no stun, no death)