This page is for a framework I've written for producing custom playthrough challenges for Terraria simulating a particular character's journey through the game, along for a place for me to put up the ones I've created thus far. If you're interested in making your next playthrough a little different, looking for an excuse to use a weapon that's never really worth it, want to see how your favourite character would fare against the Moon Lord, or just curious to see what decisions I made, then read on.
The framework explains the base concept and goals, defines a number of important terms and the default playthrough conditions and rules, and is generally recommended reading if you want to make sense of anything else. Feel free to check out the character specs first; this is more of an FAQ, so come back to it if any questions are raised. Most important thing to keep in mind is just "don't use damage sources (weapons, flasks, traps, etc.) or Journey Mode abilities unless the character spec says you can".
Character specs are categorized into groups; broadly speaking by franchise, although exceptions may exist.