What each rate and rule above actually means
The EXP rate above is a multiplier applied to the base experience MU Online awards per kill — an x1000 rate means every monster gives 1000 times its original experience. Master EXP is the separate rate for the Master Level tree, unlocked once a character reaches the level cap and starts earning Master Skill points instead of raw Strength, Agility, Vitality or Energy. The two multipliers are independent, so a server can run fast leveling with a slower Master track, or the other way around.
Drop rate is the chance, on each monster kill, that it drops an item at all — it says nothing about which item, only how often something drops. The Zen multiplier works the same way for the gold monsters leave behind. Both numbers set the pace of the economy without changing what exists: rare items stay rare relative to common ones no matter how high the drop rate is.
Max Level is the cap a character can reach through experience alone. Reset sends a character back to level 1 in exchange for stat points and a fresh climb to the cap, and it becomes the real measure of progress once players are sitting at that cap — full mechanics are covered in the Reset Guide.
Beyond raw stats, REX MU runs a weekly Castle Siege between guilds, live Rankings across characters, guilds and PvP kills, and the Gens faction war between Duprian and Vanert. All three read from the same live server data shown on their own pages, updated as it happens rather than on a fixed schedule.