penetration items?

[Saulot]

We just know things... mysteriously... heh

Seriously, if you want to see what a weapon does, just click on it, when a unit or commander is wielding it.

Most of the time it will list all the special effects it does.
Sometimes, if it has both a secondaryeffect, and a secondaryeffectalways, only one will show up.

Also, I personally use the Dom3 Database, which has a lot of information about the game, and saves time in having to look it up in game.