Me and my brother have started playing vindictus a lot here recently for the first time, we've only killed two of the "god of fomors" boss ever... hence the fact that we are new to this game. I watched my older brother go to rocheste and come across the fountain accidentally. It asked him to throw in a coin and when he did, it replied saying that he would receive luck and a little back today... We was clueless... not long after, he joined a lv 60 raid,.. got a 4 star raider chest worth 20m! The moment he completed that, he entered "god of fomors"... then he received the light splitter scythe worth 70-100m!
The fountain is completely random tho! I tossed a coin and it told me id have luck if i wore orange clothing. My buddy toss a coin and it told him that he was going to have a shitty day lol. On the bright side, it can be done once a day.