You need to be at least Level 45 to receive this quest. You need to be at least Level 39 to turn-in this quest.
Summary
You have 3 minutes to reach the pond in the north of the Abandoned Fortress, put out the flames on your body using Water Bucket and return to Lame Aysus. If you fail you have to go back and ask Lame Aysus for another chance.
Notes
Spoiler Alert! We have some more information about how to perform this quest but recognize you might want to try it on your own before we tell you the secret...
Body on Fire placed on you does 100 points of damage per tick, making it not terribly dangerous unless you do not realize what is happening. Honestly, it almost killed me before I noticed. If time runs out before you succeed, you will have to abandon this quest and start it again.