For random levels you have two choices the way explained in the second video tutorial, or you can leave it all up to the engine, which they haven't explain thoroughly in relation with Preditor yet.
The wiki you linked to is actually a fansite's, but most of the info found there is due to openness Runic Games has been with questions related with preditor, and the game in general.
The screenshot, if you seen the full one, it actually looks more dwarvish than gnomish.
omnifas
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