Just a few things:
-All of the old maps should be revamped
-New armors (or just with good recolored textures)
-New weapons, pets, affinitys, mobs, laca, etc.
-Level Cap 165-185
-Balance changes like Warmaster most HP, TK most defense, Highlander lots of dmg, Mage Dmg Dealer (that everyone fits in a role)
-New skills (just a "nice to have")
-Creative events
-New or extended phoenix system
-Not higher than +19
-Lvl 132 for rogue and mage
-Extend all lvl 132 skills to lvl 6 and just buff lvl 4, to make them useful in normal PvP
-Custom Raid
-Cash Shop, maybe a decent cover npc (Not something like a weapon or armor shop, shit like this just ruins the game)
-More "endlvl" (some easy and some hard to get) armors/weapons to create a marketplace and make the game(sets) more individually
-Special event items (like a special weapon with the same stats as the best weapon in the game at this point, covers etc.)
There is a lot more stuff, but since no one will make a server like this I will stop here.