Shame that you have a pb with this quest...
As you can suppose it, this quest works, no doubt, but some bad and unknown circumstances may happens and break the script
I know it is not a funny situation but you can play an another Lilith game. A good occasion to improve your gameplay in Jalavia and finish this quest with another toon
Anyway if you skip this quest you have to know what you miss. Fortunately this quest is not fundamental at all.
You miss a free visit of Linlys but you have seen it from the high ^^
A special bonus reward about your Mana (see the topic about quests and rewards)
And a new Merchant
Not a big deal but of course always good to take