It's important to be clear that when you have a creation with you, ie a clawbug for example, that whatever essence you used in that creation cannot be regained until it dies. If you absorb it you only get about half back. So best to let it die unless you REALLY need that essence. I try to leave about 10 essence points when I make a creation (I only have 102 right now total) so I have enough to cast spells like heal, cure, and unlock. Essence pods are good, but all you need to do to recoup is to go to a friendly village (Vakkiri, Ellrah's Keep, Pentil, and Kazg will work unless you've made someone mad there) You don't even need to find the pools there, you need only go in and you're replenished. I always return to recover from battle before continuing to another world. If you've cleared all the areas (or at least made them passable) so they're green you can jump to ANY area without having to go in sequencial order. I'm working on the East Docks right now, but I can jump to Vakkiri quite easily since everything inbetween is cleared.
Hope that helps
Auri