There are 4 monster types in the field

There are 4 monster types in the field:
Normal Mobs = the ones in the field
Big Mobs = its like Normal Mobs but bigger and with your name on it - gives a decent amount of EXP it's respawning beside you when you are grinding (no limit as long as you grind within the 2hrs stamina)
Elite Mobs = with Aura - gives a lot of EXP  (has limit of 5 kills per day)
MINI = the one with Claw icon  (has limit of 5 kills per day)
MVP = the one with Skull icon  (has limit of 5 kills per day)

NORMAL MOBS & BIG MOBS

ELITE MOBS:

MINI

MVP