Penetration is not clear

[Sergey]

So, warriors have troubles with damaging a knight while archers do good damage to him. Is this because archers have a better penetration? Penetration stats are not in their encyclopedia page...

Same with many other values. What does unit experience influence for example?

[mk31bolo]

Units (and heroes) gain experience to level up and become more powerful. Anything increasing exp will level them faster.

Penetration lowers the target's resistance. It seems that whatever type of damage a unit does, it gets matching penetration.

For example: A One-Wheel Boy does physical damage, while a Spider Cannon does explosive damage. A ring of penetration on the OWB would provide physical penetration, but that same ring on the SC would provide explosive penetration.

So, if an attacker had physical penetration of 10% and the target had physical resistance of 20%, then the target would only get 10% resistance (i.e. 10% reduced damage) to that attack. At least, that's what seems to happen. If anyone knows better, please say so. :)

You can get a damage popup by selecting one of your units and hovering your mouse pointer over a target. Penetration effect is in the middle section.