Added traveling worm warnings and a concrete buffer

I gave approaching buried worms a traveling surface wake. The warning moves through the sand with the creature, so players can judge where the threat is heading before it surfaces.

Warning time allows an escape, and completed concrete protects a surrounding strip as well as the slab itself. The encounter rules also account for passengers and keep naturally spawned worms away from an immediate player contact.

“Approaching worms leave buried sand wakes; warnings allow escape and concrete protects a surrounding strip.”

The clips initialize one native elder worm in a buried approach for a controlled inspection, with rival forces omitted and their existing accounts marked defeated, and follow its traveling wake from two fixed observer views. They do not show an exposed worm head, a natural spawn, a player escape, a concrete-defense encounter or populated-campaign performance; the encounter rules are supported by separate development checks.