User blog comment:ClayHuang158/Necrius/@comment-25235491-20161021132556/@comment-3391671-20161024091709

The maximum Necrius can gain by returning to base is 10. If he returns to base with less than 10 Essence, he'll be refilled to 10. If he is over 10, then he will not gain any at all; it won't reset his Essence count to 10.

I was the one who had recommended this idea. He had it in mind, but it was not until I said it word for word did he agree that this was the way to go with not abusing returning to base as a mean to refill all resources..