Level 43 Mercedes Quest

[Shiek]

Heey, I need help with this quest. How do I obtain this potion? o.o

http://imageshack.us/photo/my-images/8/questmercedes.png/

thanks ^^

[Bandow]

Go to the highest point in ellina there should a tree trunk with water in it.
Click that

[Shiek]

Thanks a lot! :D