This is the collection quest given out by Eeny. Collect 15 Eggs, Sacs, Scales, and Blood vials that drop randomly from snakes in the zone.
The reward is great, the quest is not easy because it takes so much time to complete...however...
Could you please take a look at the drop rate of the blood vials vs. the other 3 drops. It seems to me (and others I've spoken with) that the blood vials are exceptionally rare. I can only speak for myself, but when I had collected 15 eggs, sacs, and scales, I still had 12 more blood vials to collect. Perhaps this is the way you intended for them to drop, I just wanted to bring this to your attention...
Aarcore
PS - Maybe give necro and SK Shissar in the zone a higher % chance to drop blood vials, that should even out the drops.