Fenfire is a free action RPG in the spirit of Diablo 2 that runs in your browser — no install, no download. This is its Codex: tiers, themes, bosses and monster registers, in a free browser ARPG inspired by Diablo 2.
Maps drop as sealed charts. Opening one tears a red portal to a remixed instance of a zone you have walked — a fresh layout every time, re-lit to the map's own register, populated from a wider monster register than the campaign ever uses, and closed by an authored boss that exists nowhere else. Charts drop with their modifiers already rolled: you judge the map before you commit to it.
A magic chart rolls one reward and one risk; a rare chart rolls two of each. Every risk carries its own item-quantity bonus — juicing a map is choosing which downside your build can survive, not rerolling for free upside.