Now there are a million clever ways to add more kung-fu to this game, but I know my New York crew and I know that if I'm gonna spring this on them I need a system that is simple, fast, and requires very little on-the-spot-making-shit up during combat or character generation. We'll see if they bite...
So here is:
The Simplest D&D Kung Fu System I Could Think Of
- Each PC, NPC, and humanoid monster has a certain quantity of "kung fu numbers"--these kung fu numbers can be any number from 2 to 19.
- The quantity of kung fu numbers a character has is equal to his, her, or its dexterity bonus +1. Monsters can, alternately, have a number of kung fu numbers equal to their hit dice.
- Kung fu numbers can be chosen by the player during character generation (and the DM during adventure-writing) or can simply be 2, 3, 4 etc. or 19, 18, 17 etc. for everybody to keep things simple.
- Rolling one of these kung fu numbers (naturally and unmodified) on an ordinary to-hit roll in melee, whether or not this number indicates a melee hit, means that the character has maneuvered themselves into a position suitable to perform a kung-fu move. This kung-fu move effect is in addition to any damage that may or may not have been inflicted by the same roll.
- The kung fu moves available are: disarm, prevent opponent moving* for one round, move opponent 2 tabletop inches in any direction, knock opponent to the ground, take something from opponent, grab opponent--or anything else within reason that does not simply cause more damage.(i.e. you can cause more damage by knocking someone into a flame pit but you can't say your strike just 'causes more damage' without some situational reason.)
- A character that successfully rolls his, her, or its kung fu number(s) may automatically execute the move of their choice. The effect occurs immediately.
- Common-sense restrictions apply--like you can't knock a giant snake over.
- Ninja, kensai, and monks all get one extra kung-fu number.
*The victim can fight, shoot, cast spells, etc.--just not move around the tabletop.