You might try the novel Eifelheim for inspiration. In 1348 an alien ship crashes in the Black Forest. It’s wild exploring how the Jesuit priest, peasants and villagers react. The author throws a lot of medieval trivia around and it’s fascinating.

@Shkshkshk @rpg a big thing about aliens is that the concept works because there is only humans in our world, so they are true aliens to us. The moment there is diversity of intelligent species, the impact is lower in that aspect. I think that what you need to ask you is What makes this aliens and not just another specie that comes from somewhere else? What are the rules that are broken with their presence? What constitute their alterity? The answers to that will guide you to what you are after

If you look up Expedition To The Barrier Peaks it’s a dnd module from the 80s where the party investigates a crashed spaceship and deals with robots and aliens, it’s still pretty good I’d say

@Shkshkshk

For the mechs, either magic statue or nerfed iron golem, but requires a rider vulnerable to called shots and the whole thing is vulnerable to electricity.

Aliens? Make them weird. No, weirder. No, weirder than that. Have them make mistakes or horrendous assumptions based on mistranslation or skewed concepts.

@rpg

If you’re looking for some inspiration, might I suggest the Orz?

Weird talking fish aliens whose language can’t always be properly translated. Replacing more alien concepts with words like *happy*, *frumple*, etc.
Part of the fun would be to determine if being called a *happy* *camper* is a good or a really bad thing.

@Shkshkshk @rpg Given that magic and high fantasy are commonplace in D&D and the average character sees ten impossible things before breakfast, it’d be hard to pull off something truly confusing/surprising.

Maybe something like the Borg that very distinctly meld technology with organics, using technology that’s utterly alien to a fantasy setting, like calling in an orbital bombardment or plasma beam rifles or energy shields.

Palladium RPGs have a concept of mega-damage. It’s 100x standard hit points. So 1 md = 100 hit points. But more than that, regular damage points make no effect on MD items, vehicles, etc. Like how a very powerful character could deal 100+ damage, but if they tried that against the side of an aircraft carrier, it wouldn’t hurt it structurally. But if a tank shot it, it could damage the ship.

So there could be a lot of calculating of effects and then there’s no effect that actually applies.

Something like that.

If you want the characters to be confused, but not the players, pop in some classic tropes.

Two that spring to mind:

Transporter technology - High pitched noise, swirly patterns, a vague sense of being dissolved, then the reverse.

Impossibly sterile rooms - no obvious furniture, panels on the walls automatically open to provide things, beds rise out of the floor, etc.

For your average d&d party, stuff like getting zapped to another plane of existence, potentially including literal hell or a plane made up entirely of gears, isn’t an entirely unexpected circumstance. I played in a game one where due to some crazy shit happening to us in the feywild we ended up in sort of the backrooms of the D&D multiverse with an impossibly long tapestry hung on the wall that was a physical manifestation of the weave.

Between those sorts of hijinks and flying around on spelljammers through interplanar space with crystal spheres and all of that mumbo-jumbo, aliens, space travel, and alien technology almost look tame in comparison.

I feel like your best bet to really confuse the characters is probably to have aliens simulating a normal d&d environment for them- maybe the room they wake up in on the ship looks very much like a stereotypical d&d tavern, but little details are wrong. Maybe there’s a bard strumming away on his lute but his fingers don’t quite match up with the notes he’s playing, and the bartender asks if the party would like a “brewed and fermented barley beverage” instead of an “ale”

And the clothing the rest of the people there is all strangely generic and maybe a little dated and things are just generally not adding up, like why is there a red wizard from thay happily playing cards with a waterdavian city guard, and why is that guard drinking in his uniform? and are we even in waterdeep right now? because the elf at the table over there is reading a baldurian newspaper, and also holding it upside down. And is it just me, or are there a whole lot of twins and triplets here?

But things like detect magic aren’t turning up anything fishy because it’s not magic, it’s science.

And maybe when you try to tap someone on the shoulder to ask what the hell is going on, you phase right through them because they’re all holograms. A simulation orchestrated by the alien abductors to help the party feel more comfortable and so that they can study them in something close to their natural environment.

@Shkshkshk @rpg Clarke’s 3rd Law: Any sufficiently advanced technology is indistinguishable from magic.

So magic users are going to be really confused, because this magic is totally unlike anything they’ve ever encountered.

Think hard about how D&D magic interacts with the alien tech.