Basic Stats:
HitPoints (HP)
How much damage a creature can take before it flees or dies (Pets flee/Prey dies).
Maximum Hp for most creatures is 100.

Attack (ATK)
Atk reduces the enemy's hp by 1/2 of however many points are in it.

Avoidance (AVD)
Avoidance is the % that the enemy does no damage to you.
A creature with Avd might not have Def. Max is 90.

Defense (DEF)
Defense reduces an enemy's attack by (Def/5). Max is 90.
A creature with Def might not have avoid.

The last stat is Special Ability (SPC) which is explained below.

Special Ability (SPC):
Effects are color coded with an ability.
If the result of an equation would be a decimal round down. (1 is the lowest you can round down to)

Stun - Enemy cannot attack for (Ability points/5) turns.
D.o.t. damage over time - (atk/10) over (Ability points/5) turns.
Strong Attack - Attk+(ability points/5)
Heal - regain (ability points) Hp
Buff (Buffs increase another stat for a period of time)
Hp - +(hp/5)hp for (ability points/5) turns.
Atk - +(Atk/5)Atk for (ability points/5) turns.
Def - +(Def/5)Def for (ability points/5) turns.
Avd - +(Avd/5)Avd for (ability points/5) turns

Even if a creature has multiple abilities listed on their stat page you can only pick one.
When your creature levels up you will be able to choose from more abilities.

How to Create Your Own Special Ability:
    This can only be used on creatures that have CYO as a special ability.
    To create your own special ability just pick a name and an effect.
For example I want to have a dragon that spits fire. His fire will burn the opponent and when they attack it will be painful, so I decide to use a d.o.t. ability.
    It would look like this on his profile:
    Fire Breath
    The name is one I came up with and the color means that it's a damage over time ability.
Have fun. ^_^

Leveling:
(Highly experimental at this point)
    Your creature starts at lv1 with the stats shown on their species' page or if not shown, a dice roll.
    To advance you have to kill prey or defeat enemies.
    The experience you need to get to the next lv is 2 times (Atk plus Spc).
    Each Lv you get 5 points to distribute to Hp, Atk, Avd, and Def.
    You can "Even Stat Build" - putting one point on everything, you can "Stat Dump" - put them all on one stat, or you could put different amounts into different stats. It's all up to you.