Chance to upgrade your lesser essences into greater essences, which are the limiting factor in crafting. For every 10 lessers you send me I will send you 1 greater of the same type.

For example, mail me 100 lesser good essences and I'll mail you back 10 greater good essences. Mail me 1,000 lessers essences and I'll mail you back 100 greaters of the same type.

Send mail to Mystera or contact me in the game (I prefer mail as its faster, but up to you).