It's still a fantasy world, but it's got a post-apocalyptic vibe, a prison should be  location for the story.
I want the character to break in and out of the prison at different points. You can make up the reasons; friendship, vengeance, idc.
A major mechanic is the prison break. Especially as the PCs realize that they will need to do it repeatedly, if they're smart they'll start leaving tools and partially ready paths for themselves, without leaving signs so obvious they'll be detected while the group is away.
Enemies are the prison guards, who are somewhat generic. Also some of the prisoners become enemies with unique personalities and abilities. One might even be an ally at one point who becomes an enemy. There are also classic enemies throughout the campaign, since there is a world beyond the prison.
That's what I've got in mind, please fill in the rest for the start of this campaign.
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