Front end is dbuzz, which I thought would be obvious as that is stated from my post information - and the tag I added to my post. I can see now though, that this information is for some reason not shown

Those systems use a d20 based difficulty check system. Basically the task at hand is given a Challenge Rating (CR) by the DM which the player then rolls a d20 for, adding or subtracting the modifier for

Nice to see more role-playing content on here, and by a fellow Dane even. Spændende læsning!