Distant thunder seemed to roll off the peaks of Callos IV, muted under the heavy cloud cover that had been forming for the last several days.  The thunder would be silent for minutes at a time, then five or six roiling echoes would sound down the steep canyon walls leading further back into the mountain fastness, sending the occasional small pebbles cascading down from further up the rocky slopes from the mile distant rumblings.

Must be at least eight main batteries up there hammering t. . .