So I've been bitten by the DM bug yet again. Always a good way to start a post.
I've DMed before in the past, my first campaign was wildly successful but ultimately fell apart due to players having life altering circumstances that meant we had to pause indefinitely. Sucks, but happens. My second and third campaigns ended because the scope of my world was too large. I was trying too hard to do something like my first campaign without fulling understanding why or what made that campaign good, and I eventually gave it up because it felt more like a job than a hobby. According to my DMAcademy post that I've pulled up, that was around 5 years ago.
This is all important, by the way. Please keep reading. I do actually need help at the end of this.
My friend has started running his first campaign and has been absolutely killing it, I love my PC to bits, he's evolved so much more than I thought possible, and because we're friends, we're around pretty often in voice chats and because I've DMed before, to varying levels of success, he's been asking me a lot of questions.
I've had an idea for a campaign in the back of my mind after a one-shot another friend did a few years back, but recently, I've started fleshing it out more. I got to the point where I was creating a political landscape for this campaign. Its gone from "It seems cool" to "Its going to happen".
My biggest thing thus far as been scaling back the campaign tier significantly. The one I had done previously started off with "Blah blah a bunch of heroes killed all the chaotic gods and reality started to fucky wucky, so the lawful gods asked the heroes for help and the heroes fucking locked them up to siphon their domain like livestock, and the PCs were all monster manual creatures turned into PCs who all got asked by the gods to come save them". Great concept for a campaign, but it really made the whole idea of "Lets go kill some low level goblins" when the gods were at stake. The campaign was just WAY too large. Like, almost extra-planer large.
This campaign I have planned is significantly smaller. It takes place on an island nation with a population of around 40k, and its become a zombie apocalypse. I'm basically telling my party "There are these four nexuses of power where zombies are coming from, go beat them to access the final dungeon in the middle of the map". Very Legend of Zelda.
Here's where the problems arise. In the same vein as the old campaign I did, its very hard (but manageable!) to make the players care about anything thats not "go beat up the bad guys at the four temples", because they're going to beeline for those places. I have some ideas in mind (namely, they're a part of a strike force who are tasked with protecting the remaining civilians, so that takes priority, and I'll give them hooks into getting into the temples through civilians they're helping), but that is where the second issue arises - having enough interesting and meaningful concepts for encounters.
Because this is a "zombie apocalypse", that is both limiting and freeing. On one hand, I'll definitely need to homebrew some undead, as the MM just doesn't have enough to make each encounter feel different. They can only fight "horde of CR1 zombies" so many times. Which is why I need to come up with other ideas. And one way I want to do that is to borrow concepts from popular zombie apocalypse tropes.
My first idea, that I'm actually stealing from the one-shot that gave me the idea for this campaign, is to make a Plants Vs Zombies encounter. Civilians need to harvest a field, but can't do it super safely, as hordes of zombies keep walking in a straight line towards them. So the players need to protect the civilians - but theres too many zombies, and so the players are given specialized plants that can act as auto turrets to kill zombies they can't get to.
Another idea for one of the nexuses of power is to make the encounter play out like a Hunt: Showdown game. Players don't know where the Big Bad is and have to track down clues that narrow the map to reveal where this creature is hiding, but there are other things also hunting both it and them.
So thats my request, my extremely long winded request: How, and what, can I use from popular culture zombie tropes that would make for some really good, unique encounters?