Those other lists of 30
Larping is Live Action Role Playing. Instead of sitting around a table, play is done “in action”, up and moving about. Any resolution besides social ones are done by some “lite” mechanic. It can be a great deal of fun.
Animals have parasites and diseases, so do plants, there are even bacteria that cann dissolve oil spills or plastic or what have you - why couldn't there be a disease living off magic - a magic item could be infected, losing power and speading the plague to other equipment it contacts, while a magic user would slowly lose his powers and contaminate all he works with or casts a spell at...