How it works
The number die picks where the walker steps. That destination fires. The slot the walker left gains trail marks, which some weathers read. This tests whether a moving focus makes the board richer or just harder to read.
Legend
Walker: the current focus. The rolled slot becomes the walker.
Trail: the slot the walker left gains a trail mark.
Jal: after the main fire, a trailed slot also fires at half.
Agni: all existing trail marks burn the enemy for bonus damage.
Vayu: the fired card returns to hand.
Akasha: all occupied slots fire at half and the trail is wiped.