The Last of Us season 2 is on right now at HBO. Let's send the party towards the Fungal Sanctuary, where large mushrooms like to spread their spores!
The map has a total of 5 phases and with each there is less and less ground without the fungal infestation. Maybe it's the mushroom people, maybe a bloater and some clickers are lurking in a cave, or a druid has been messing around with cordyceps mutations?
If you are playing DnD 5e, consider the following:
make the fungi difficult terrain,
require a saving throw from creatures that enter the area or end their turn there against being restrained or perhaps having their action influenced by the fungal network
deal damage to creatures in the area - necrotic, poison or psychic
have the spores reach the surface and start a full-on outbreak should the party not stop whatever caused the spread
Gridded and gridless variants of the 1st and 5th phase in high resolution can be found here, in the Ruby Stash, together with all other maps available to you upon subscribing!
Emerald Tier patrons gain access to three other variants in high resolution with extra file sizes depending on your needs, be it smaller for free Roll20 or larger for printing.
You can find them here, in the Emerald Stash, together with all other maps available to you upon subscribing!
May the climbing abilities of the adventurers finally get an opportunity to shine!