There are plenty that could survive the crash, take enemies from the HOTD module and put them under rubble, investigating the ruins or alike. A crash isn't going to kill vampires, powerful wizards, dragons or magic item like rugs of smothering. You can repurpose encounters from there
Some others:
The previous adventurers as undead or severely injured and in the process of dieing
Dragon cultists or dragons recovering/ exploring the crash site
Treasure hunters
Kobolds, you could even do something funny like saying they hid in the bag of holding :P
Scavengers come to feed on the corpses like wolves or hyenas or ghouls
something form the area it crashed, maybe it crashed near a fey wood and there are fey around or an orc camp. Stick a catoblepas in the middle eating grass. Go wild
a cursed item of tiamat curses the party. Something like a haunted trap from van richtens guide
It really depends on the vibe you are going for. You can make it dark and spooky ruins, it can be a light hearted adventure or the solemn tragic last gasp of fallen heroes.
There are plenty that could survive the crash, take enemies from the HOTD module and put them under rubble, investigating the ruins or alike. A crash isn't going to kill vampires, powerful wizards, dragons or magic item like rugs of smothering. You can repurpose encounters from there
Some others:
It really depends on the vibe you are going for. You can make it dark and spooky ruins, it can be a light hearted adventure or the solemn tragic last gasp of fallen heroes.