This is beautiful. Again, I love the balance of this altar. The stone spiral is a great idea that can be used on the ground of an outdoor altar, too. The only problem is the spiral is going counter clockwise.
Candle light wards might also be another thing. I can see Tsava Leko having wards based on candles around their caravan. Though I think his own wards where originally dolls that he used to focus elemental powers into.