By David Black
Each character has 3d20, one for Body, Mind and Soul. These are Effort die. Players roll these die to to complete tasks, they need to roll a 4 or higher to succeed at any task - but if they do succeed they lose that die. A player can 'split' the d20's up, turning them into 2d10 or a d12 and a d8. Whatever combination of d4's to d12's they can - and they can 'reform' die together whenever too. Some tasks have an minimum level of effort, requiring a minimum Effort die to be rolled to accomplish the task, for example a d6 or a d20. Tools give you an advantage, increasing any Effort die to the next highest one d8 to a d10 for example. When you run out Effort die in any area you can no longer contribute to the adventuring until you have rested.
Source: http://dngnsndrgns.blogspot.co.uk/2015/10/another-simple-dice-mechanic-rpg-system.html