A quick synopsis: my players (lvl 4) are on a planet that is itself plagued. Direstone, the source and main vector of the blight, spreads through creatures and earth alike, slowly converting everything it touches into more Direstone.
In creatures, the disease eventually turns them into feral abominations, which hunger to replace their mutating tissues with healthy beings. So I'm throwing a lot of undead at the players.
I'm trying to build a system to simulate different levels of Direstone poisoning and exposure, building up into what is essentially zombism.
I know I want to have the poison build up for them...more like radiation than Zombie Rot, but I'm not sure how to apply cumulative penalties that aren't totally crippling (I want the players to feel it, but not to die to it instantly!). This stuff figures heavily, so they're going to get a lot of exposure.
I am thinking of attempting to adapt this document https://docs.google.com/document/d/1a5qjVk_F_IhQ0HPgKW0P6E_i3anYBFKLqjH7xPy Fw5w/edit?hl=en_US#
But any guidelines, advice or ideas would be very helpful. THANKS!
One of the board regulars on here posted this ages ago Wild Wasteland Radiation. While I can't find the orginal post, I did save a copy of his/her rules to my google drive.