Realms of Mythrais
Medium Armor movement is 25 feet instead of 20 feet!
Critical Skill Checks! If you roll a 20 on a skill check, it is an open ended roll; so if you roll and then roll again and get a 12, your total is 32 plus your modifier.
Note, this does not mean that a 20 will always hit! Only if your additional points allow you to have a total that would hit can you say you have scored a “hit” against very high armor classes and etc.
(more to come)