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7 votes
2 answers
647 views

How do I determine a baseline difficulty when converting a d100 system to a d20 system?

How do I mathematically determine a baseline difficulty number when converting a d100 "roll under" system to a d20 "roll over" system? The Basic RP system (and variants) uses a ...
William M-B's user avatar
  • 2,419
3 votes
0 answers
268 views

Implement Ars Magica magic system into Rolemaster [closed]

I was wondering if someone has tried to implement the Ars Magica magic system into Rolemaster, and how. I guess you could assign some cost to the forms and techniques, maybe scaling its values to a ...
JoePerkins's user avatar
3 votes
1 answer
212 views

How Do I Reverse Engineer Ability Checks from 3e to 2e?

This question relates to how the designers of 3rd edition might have come up with the roll-over Ability Check mechanics from the roll-under Ability Check mechanics of 2e. The problem I'm trying to ...
He'sJustThisGuyY'know's user avatar
8 votes
2 answers
787 views

How can I simplify a series of rolls without changing probability too heavily?

Ok, I'm working on a combat system converted from a video game to a tabletop game, and I'd appreciate some feedback on how I can make my combat defense system work. Currently attacking is handled as ...
Kyle Willey's user avatar
  • 12.7k
6 votes
2 answers
795 views

Handling merchant inventory with lots of items?

Ok, so I'm converting a roguelike video game to a tabletop game (GearHead, if anyone's interested), and I'm running into a catch where I want to keep the tabletop game essentially compatible with the ...
Kyle Willey's user avatar
  • 12.7k