aria server. mob marluk lord in antharas lair, has deadly poisson 19lvl, which is during more then 5min. after 10 sec time, poisson dissapear and start again.
that's how it's suppose to work it says : if you do not cure the affect it will increase it's power and time. so the only way to get rid of it is a) relog b) ask se/bish/ee to use mass purification.