True Neutral.
Following a cycle does not Lawfulness make; a cycle can involve taking the status quo, tearing it down, and rebuilding a new one in its place. An essentially neutral act, in my mind, and one that nature seems to follow, to a degree.
After all, a cycle is all about change - a chaotic act, but it follows a pattern - a lawful one. As such, they cancel each other out, for an ethically neutral standpoint. The cycles aren't necessarily all in sync, either - be they the lunar calendar vs. the rotation of the planet around the sun (not quite a fantasy example per se, but still applicable), or the differences between the cycles in a mountainous region, a tropical one, or on the coastline. Natures cycles tend to be roughly regimented, as well, even without interference of people, or what have you. A volcano explodes, and winters grow longer from all the dust in the sky.
An utter lack of cycles, everything being maintained the same, would be a bit more in-line with lawfulness, whereas unpredictable change would make for a more chaotic bent. Reliable change seems more an aspect of ethical neutrality.
Morally, life and death, the taking of one life for the benefit of another, who in turn offers their remains up to the other, and so, seems a good candidate for neutrality as well. I don't believe most folk are going to argue with that.
Just like with most nature deities, True Neutrality seems to be the most appropriate alignment.