Before I start I first wanna say that I have no experience with javascript and my free time doesn't give me a lot of opportunities to learn it on my own. But nevertheless I think a lot of DMs would find this an awesome mechanic to incorporate into their games (especial post-apocalyptic survival campaigns) so I've just gotta ask for some help. So I've got this idea for a tabletop session that involves having my players go through a zone filled with a hazardous gas. The gas when inhaled weakens your character and causes their rolls to take negative modifiers. The only way to avoid this de-buff is to wear special masks that filter out the toxins, but these masks will randomly degrade overtime. After a certain amount of in-game time I roll a d20 for a "degradation check". If it's a 14 or lower the mask does not degrade but a +1 to the next check, increasing the chance it will degrade. If the check comes up 15 or higher, the mask gains one level of degradation and the character takes a -1 to all their attack and physical skill checks. The degradation check process restarts and if another roll adds up to 15 or more the mask gains another level of degradation making the character take another -1 modifier. At level 3 the character passes out. HOWEVER, the player MUST NOT SEE THIS modifier when they roll. I want to make it so that the only way a player can tell if their mask needs to be replaced is if another character checks it for them. Not only that but due to the nature of the gas and the mask's design, characters cannot replace their own masks. This mechanic will force the players to cooperate and keep a close eye on each other in order to survive. So, my question is, is there a way to incorporate this into Roll20? Can an API be built for me to keep track of my player's masks and hide whatever negative modifiers they accumulate? ex if a player does an athletics check and rolls a 5 it instead shows up as 4 on their screen? (minimum roll will always be a one, regardless of degradation level.)
