I am working on an adventure and trying to decide which system to use for stats. The potential options that have some currency in the collective psyche right now seem to be: the first gen retro-clones (Swords & Wizardry, Labyrinth Lord), Lamentations, DCC, Fifth Edition, and B/X Essentials. A stripped down 5E stat line seems like it may have the greatest reach and functionality of these options.
For personal use, the choice is largely irrelevant to me numerically, as I am comfortable ruling and interpreting on the fly for the most part. However, ease of use and discoverability are factors I consider when writing for others. The clones of TSR games (first gen retro-clones and B/X Essentials) are all mechanically equivalent, apart from minor differences in magnitude assumptions (traceable largely back to the different dice used by OD&D, the basic line, and AD&D). I suspect that it might be less intuitive for a 5E referee to upconvert from an OSR stat line than it would be for an OSR referee to downconvert from 5E.
I would avoid using the official style stat block, which sacrifices page real estate to standardization. For example, only a totally inflexible rules drone would need text to tell them that a trebuchet is immune to sleep spells or that a suit of animated armor is immune to being deafened. (Seriously 5E designers, WTF?) It seems most functional to select key stats and use 5E terms when the choice would be otherwise arbitrary.
Assuming 5E stats make the most sense in some form, I see two possibilities: 1) present a stripped-down form of 5E numbers or 2) present both “old school” and “new school” stats explicitly, but still tailored for concision. I suspect option 2 would be more accessible, but also less elegant. An example of option 1 (5E numbers, implicit conversion) might be:
Goblin. HP 2d6/7, AC 15 (lightly armored), proficiency +2, STR -1, DEX +2, WIS -1, CHA -1, stealth +6, challenge ¼ (50 XP), disengage or hide as bonus action, see in the dark
This is actually almost 100% of the information present in the official stat block. Even with super-vanilla goblins, weapon details would vary and so I see minimal benefit to adding them in the actions section (and of course I would rarely use super-vanilla goblins). Option 2 would have two subsections, prefaced with Old School and New School labels respectively, and probably take 2-4 lines for the full stats of a monster with medium complexity. While I like the no-nonsense approach of just calling out that categorization, you can probably imagine yourself what it would look like. In the process of writing this out, I am leaning toward option 1, if using 5E numbers is a given. Just doing a simple Labyrinth Lord or B/X Essentials presentation also remains appealing. I do like the ability to use the DEX, INT, and other stats as easy ways to call out agile monsters, and so forth.
Guidelines for conversion
- DCC. 5E constitution, dexterity, and wisdom saves can serve as DCC fortitude, reflex, and will saves.
- Descending AC. To get a descending AC value, subtract 10 from AC and subtract that from 10. (So: 18 ⟶ 8 ⟶ 10 − 8 ⟶ 2.) Starting with 5E values actually yields pretty good results from this procedure, compared to 3E/4E, due to the bounded accuracy design principle. It is also worth remembering that even if numbers are off by 1, that just means differences of 5%, which is unnoticeable in practice.
- Old school damage. Ignore proficiency when rolling damage. So the goblin’s 1d6+2 damage becomes a flat 1d6.