Ah—well, for example, many of the plants in Klein have a profound effect on us when they've absorbed an abundance of essence—life energy, of a sort. When consumed, these can cause numerous physical reactions from fevers to intense arousal, and even physical transformation if the essence is abundant and chaotic.

[It's fine, he can still hide the embarrassing part with a biology(?) lesson. Maybe one day Kleken will hear about Olivine's exploits with suction pumps, but today is not that day.

Probably.]

In those cases, the most common antidotes are to counteract the effects with a balancing of opposing essence. At their most extreme, it's also possible to release corrupted essence by puncturing the skin and allowing it to drain. And... in general, sharing essence from someone else can be used to easily regulate your own.