I found a solution, some players posted on forum that somebody can easily kill him. That's because is a bug in the jewel of harmony option, in weapons, the joh option increase max dmg. can be upgraded to 10.000, same in armor, increase defense +10000.
I know some players who exploit this bug, i think they must be punished because nobody reported it... only abused of it.
players like Yamila and eddy02. Tha's all the names i know D: