Spending Essence to gain Essence
Solution 1:
It just means, if you've ever used the Dreamgate, you're more likely to gain Essence until you've recovered all the Essence that was spent on Dreamgates. So you can't use this to farm Essence. (There's also absolutely no need to farm Essence, since the game has a lot more than you'll ever need, and even with the quadrupled rate it's a very very slow process to collect it from enemies.)