В задании "[Алхимия] Эссенция" точно указано количество ингредиентов.
Для данного рецепта достаточно:
Плод очарования х2
Лотос х3
Сок ясеня х4
Пыль тьмы х2

Благодарю за ваши замечания. Исправил все рецепты с вашими комментариями.

This recipe does not appear to be correct. I just tried these exact mats but it broke, however this quest from Olvia says to use Essence of Temptation instead:

http://bdocodex.com/us/quest/1200/131/

it worked for me.

The success rate of the craft in this game varies greatly depending on your skill level.
On the lower level you can fail even the correct recipe, and on higher level you can succeed with even fewer number of the ingredients.
Number of the products also increases with your skill level.