So long story short, the players are visiting (raiding) the tomb of a long dead Inqusitor who got his reputation about 200 years after Saint Drusus. Some small craphole planet made a surprisingly large shrine to him (which is where he's currently enshrined) on a planet that was described as: "An unpalatable little whelp of a world, mired in thick gasses with a grotesque array of predatory beasts. I believe the only reason it was not classified as a death world is some Administratum simpleton believed the trees were not tall enough.
So they're exploring the planet and have a few encounters with some "dog like, sort of reptilian critters." These critters have "long hooked claws for forearms." Later they encounter a few more that have some weird growths on their hands, and fire biting little beetle like critters that tear into flesh.
So far the doglizards haven't been too bad, they're animalistic and do stupid crap like sniff out grenades. For those with good visual imaginations, you can probably pin what they're dealing with.
They're in the tombs, raiding it, taking things of value, etc. I plan on having a Tyranid Warrior show up and completely turn the adventure from exploring spooky tombs to being a chase to GTFO with their ill gotten loot.
Problem is, to do this, there has to be some way they can escape. Their ship had to land relatively far from the city (it was never designed to have any landing facilities, and most of the buildings are very vertical and have conical roofs. Even getting to the gates would be bad, cause they made sure to keep them sealed, and gaunts can scale them far faster than the players. And realisticall, I doubt the party could do too much to a warrior, much less a warrior with synapsed gaunts.
So I'm trying to think of a few things I might describe slightly differently to keep up with a good chase, but give them somewhere to go. Also, nobody had the sense to get a flamethrower. Everybody has decent single target damage, but I don't see them getting close to the warrior to melta him in the face
Right now I'm thinking of finding a relatively flat roof to hole up on in the hopes of getting their Valkyrie to smack on it and to a quick dustoff.
Any thoughts or suggestions would be great.