MouRO features not only superficial changes but fundamental changes to many of RO's game mechanics.

Stats and Substats - Part of balancing (especially with a max level of 150) is to make sure that stats are balanced. Of particular interest are changes to avoid such pserver problems as insta-cast and perfect dodge.

Status Changes - These are the common status changes you can be inflicted with, how they behave differently, and what stats/cards can increase your resistance to them.

Job System - Some basics in how the job system has changed and how every class has the freedom to use practically every skill.

Weapon Size Modifers - How your weapon size effects damage here.

Elemental Tables - Our own custom elemental table!