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Message: <blockquote data-quote="dvvega" data-source="post: 2823090" data-attributes="member: 524">Actually there are many RPG systems that use something similar.However instead of saying you MUST lose 1 rank, you make a roll against a set DC to see if you keep the ranks you have or if you lose 1. You can of course tailor the DC and as d20 seems to be based on the +2 concept, it really should be 2 ranks.Most of these systems don't care if you used the skill or not - the theory goes that a skill you put points into will always be trained at some stage, but may just go down.These systems also let you gain a rank based on the same type of roll. So when you roll you risk losing but also could gain something.In game terms, you need to keep track of when you use a skill and that counts as a +1 to your check for loss/gain. A DC X would be required to keep the skill as is, each failure by 5 would lose 2 ranks, each success by 5 would gain 2 ranks. Here X can be set to tailor against your campaign. It might be level based also since you don't want people gaining ranks too often.</blockquote>