Hey i am going to tell u how to go this quest
Location:Bangkok
Condition: Must have "Eva" in your team
First you head to bangkok showen on the map
walk to the forest area where you head to get "Charlotte"
Then you will see a "?" go to it and she will ask "Eva" to leave your team for this quest then a cutscene
Then you find out the Underwear is alive.. then your teleported to an other place to fight "you will lose this fight because they do 5,000 to 9999 damage but the levels are 101-105
Then she will transform into a sword "dark Sword"
Then u will be teleported back where you met the maid the cow ghost will be waiting
you fight him again with his skeletons cow ghost level 105 24850 hp skeletons level's 101-103 hp 1201
She will transform back to her normal self
Reward: +5 amity to "eva" and 3% exp capsule