Every your attack (except orcs with range attacks ) bring you cp (paladins get cp for healing, bat for restoration don't get).
This points equal 0 at battle start. For this points you can cast soething skills, such a plague, black ice and e.t.c

With 20 level you get some strong abilities for cp, that can change battle (sky fier, instant freez, invulnerability, ring of immortality and e.t.c. ).

With 10 level, you get some usefull abilities, that may be change your game (such a steam hammer, shield strike, righteous rage ant e.t.c.). At first they won't be strong, but, if you spend some level points to them - they will be really usefull.

Skill "kill reward" give you 5 cp if you will kill enemy (support classes, such as sapper, ice witch, paladin haven't got this skill).

Sappers get's class points for totems and teleports, all their abilities - support at all (so get's 2 cp, if enemy go through trap).
Paladins gets 2 cp for healing. All they abilities - sapports.
Berserks and inqs are get cp for striking and killing.
Ice witch gets cp for freezing enemies (or for shooting frost bolts).
Gunner gets cp for shooting from cannon and when tesla pole hurt enemy's.
sister of fire gets cp for fire bolts.
Tanks gets cp at the combat.

So, you should know. thet orcs don't get cp for kerns.
For the shooting from the bow, humans get 1 cp for hit.
Dwarfs - 2 cp for hit from arquebus.
Ice witch gets 2 cp for bolt.
Sister of fire - 3 cp for bolt.

For power attack get difference namber of cp:
bers - 3 sp for fast attack, 10 cp for power.
tanks, inqs - 2 cp for fast, 7 cp for power.
Paladins, gunners, elfs, sapper - 1 cp for fast, 5 cp for power.

Almost every attack brings you cp (class points).
This points are equal to 0 at battle start.

At lvl 10 you unlock some useful abilities that may change your game (such as steam hammer, shield strike, righteous rage etc). At first they won't be strong, but if you spend some points to level them up they will become really useful.

At level 20 you get more strong cp abilities (sky fier, instant freeze, invulnerability, ring of immortality ecc).

The skill "kill reward" gives you 5 cp when you kill an enemy.

Sappers get cp for totems and teleports, also 2 cp if an enemy activates one of their traps.
Paladins get 2 cp for healing, but don't get cp for restoration.
Berserkers and inquisitors get cp for striking and killing.
Ice witches get cp for freezing enemies and for shooting frost bolts.
Gunners get cp for shooting cannon and when tesla pole hurts enemies.
Sisters of fire get cp for fire bolts.
Tanks get cp for fighting.

About cp number per attack and magic cast:
Orcs don't get cp for shooting with kerns.
Humans get 1 cp per hit shooting with the bow.
Dwarfs get 2 cp per hit from arquebus.
Ice withces get 2 cp per bolt.
Sisters of fire get 3 cp per bolt.

Berserkers get 3 cp for fast attacks, 10 cp for a power attack.
Tanks and inquisitors get 2 cp for fast attacks, 7 cp for a power attack.
Paladins, Gunners, Elfs, Sappers get 1 cp for fast attacks, 5 cp for a power attack.

This should result more readable, still good job for the post Kirk.

Thanks, i'll try better at the future.

Kirk, you did fine it's just that English isn't your first language. Better than what the Wiki offers. You deserve the credit, Qli just corrected some grammatical mistakes. Nicely done, both of you. Thanks!