This is another monster creation I came up with for D20 games, They are decedents of Trolls from long ago that came into contact with a very deadly aggressive parasitic fungi. This Fungi would kill almost any other creature including some of the initial trolls it came in contact with. Because trolls regenerate and are very resistant to disease, they lived through their infection and even began to breed. Hundreds of years later, these trolls now exsist in a perpetual sickness being weeker than other trolls, but also in symbiotic relationship with the fungus that renders them immune to any diseases. They are also exceptionally more deadly than other trolls as well, Any one who would strike them and deal damage realeases a cloud of fungous spores into the air. They also spread their deadly fungal disease through bite and claw attacks and use gobs of snot and spit as ranged weapons. I haven't decided on the final name of these creatures, I'd like to come up with something more creative than Fungus Trolls and will in the future.