open the excavation node at lynch farm (or the pig place), get a human (skilled+) with high luck to work it, dump any unused energy into the node from offline characters or if you're going afk, promote them whenever possible, and hope they get complimentary skills (or re-roll them) for the node. 3 days and I have 134 at 5/20 Investment Level (25% energy bonus) with professional human (ws 81.25 luck 22.61) with work speed +1 skill. I need to re-roll a skill or two on him.