When the last Ice Wolf is dealt with, the Mutant Lord should make it clear that the party cannot reach the crash site from the bottom of the ravine and that the ice walls are too slick to climb back up. Plus, the temperature is beginning to drop rapidly. (Give one of the characters a cold if you need to prompt them.) If they follow the bottom of the ravine, they will eventually come to a guard outpost manned by a single young human girl named Meena. If they explain what brought them here, she'll explain she saw no "lights in the sky," but she will also offer to take the characters to her village so they can rest up and warm themselves. She will take them to a nearby ice cavern and, after traversing about a mile of tunnel, the cavern will open up revealing an Ancient buried amusement park that had been swallowed up during the cataclysm. Meena's people have converted this long-buried theme park into a small thriving village.
The village elder and Meena will take the characters into one of the shantys where they will be fed and warmed. While eating and socializing, the characters should be given a chance to hear screams in the distance. If they do hear the commotion and are alert, they will not be surprised when the Stalker From the Stars (New creature, click here for a description) explodes from the floor and begins attacking the village elder. Otherwise, they are surprised when the creature appears and will miss an attack on the first round.
The Stalker is an alien from another planet who crashed in the ship the characters mistook for a meteor. (The ship is completely destroyed and is now buried forever under tons of ice and rock. The Stalker escaped using its hyperburrowing ability.) It has used its hyperburrowing to try to sneak up on the party while they fought the Ice Wolves, but they had moved on by the time the Stalker arrived. (The remaining Ice Wolves in the den are now packed away for a future feast though.) The Stalker has followed the party to Meena's village and, using its hyperburrowing ability and its webs, has been systematically catching and bundling up other villagers while the party ate and rested. It has now decided to go after the elder as well as test the PCs who seem to be the most powerful enemies here.
After the attack, if the party goes outside, they will see several villagers standing around, wondering what has happened and what to do next. Several of them feel as if they are sitting ducks for the Stalker once the party explains what they just encountered. It is up to the PCs to determine what to do next. If they split up to go looking for the Stalker, it will pick off the other villagers one by one. If they decide to stay together, the Stalker will attack without warning, overpowering a villager and quickly dragging them off. The villager numbers should dwindle until only the PCs are left. (The Ancient amusement park should make for some creepy encounters with the Stalker as it jumps out, attacks, and hyperburrows away after catching another victim.)
Eventually, the fight should begin to turn against the Stalker. When the Stalker is down to 15 hit points or less, it will use its machine control ability to take control of some nearby heavy machinery (a bulldozer perhaps) which it will send toward the party. However, if the Stalker is defeated, the controlled machine will stop moving. Once the Stalker is defeated, the party is free to release the villagers and help them recover and rebuild after the encounter with the alien being.
If the party ever does decide to investigate the crash site, a bit of digging will reveal the Stalker's escape tunnel. If they follow it into the ship, they will find it fairly well crushed and destroyed. However, they will be able to salvage the following items: 2,155 gp; a stun pistol; a stun rifle; 8 bottles of synthihol; 6 light sticks; and a water purifier.
NOTE: This adventure and its creatures were inspired by the episode “Stalker From the Stars” from the classic Ruby Spears post-apocalyptic cartoon “Thundarr the Barbarian.” Obviously some liberties needed to be taken with the original episode's plotline, but I tried to stay as true as I could to the feel of the show. Stay tuned each week for “Thundarr Thursday”!