In Out of the Abyss, you gain levels of Madness due to certain events. Every time you fail, the Madness level increases, just like Exhaustion level:
- Level 1 Madness gives you Short term Madness - ~1 minute status effect
- Level 2 Madness gives you Long term Madness. - ~10 hour status effect
- Level 3 Madness gives you Indefinite Madness - Permanent Flaw
These can be cured as listed in the DMG, but in Out of the Abyss, when you gain another level of Madness while having level 3 Madness, your Madness level goes back to 1 then you go through all the levels again.
What happens if the player gets into Level 3 Madness more than once, making him get multiple flaws due to Indefinite Madness?
My plan was that, if the flaws stack, I think it will be hard to keep track of all the Flaws so I will just replace the old Flaw with the new one.