This page lists pages that concern the apparent changes on MouRO, that may confuse you if you have been playing RO before, such as five of the six base stats now having penalties to them.
“Base stats are the six attributes that you can increase using Status Points. They are STR, AGI...Base Stats
“On MouRO, the elemental tables have been changed somewhat. You can now combine effects from...Elemental Properties
“In MouRO, the way parties work has been notably changed and several features have been added...Party System