In the fields, players will come across monster clusters.
Depending on where you are, there could be anywhere
from 1 to 21 monsters in each cluster.

HP= Health Points: The amount of health a player or monster has.
AD= Attack Damage: The amount of damage one can do to another.

If a player is battleing a monster cluster, (say for example, a cluster of 5)
a player attacks one monster, while the other non engaged monsters attack
the player.

Here is a list of the monster levels:

LV1
HP-50
AD-20

LV2
HP-80
AD-40

LV3
HP-120
AD-60

LV4
HP-180
AD-80

LV5
HP-250
AD-100