Originally Posted by
Felis
Ragnarok Online
Card system - similar like the materia system, but with more functions (autocast skills, +xx% dmg on [race/element/size] enemy, -xx% dmg from [race/element/size], card sets with set boni if all cards from the set is equiped)
War of Emperium - guild v. guild pvp to defend and conquer castles (2 days in the week each 2 hours)
Big dungeons - I wish something like Glast Heim in FF XIV, a dungeon with many levels where you can get lost if you don't know the way ^^