2020 · 代替ルール（基本ルールの変種）

Crimson Dragon Slayer Revised

A streamlined d20 fantasy roleplaying system that blends old-school play with elements of fifth-edition D&D and house rules. The rules support fast character generation, straightforward play, and rolling available dice rather than requiring multiple sets. Designed for one-shots and short campaigns, the system uses an arcade-style approach to adventure. Characters can face a full day of encounters without quickly exhausting their hit points, spells, or healing resources, keeping the focus on active exploration and combat.