Each knowledge is related to several inventions. Of course player characters can create their own inventions, just like wizards can create their own spells. The player should consultate with the DM if the invention is appropriate and of which level it will be. For each invention, listed here or not, a lot of research must be done before it can actually be built. A number of weeks equal to the invention level (see table IV) must be spend to find out everything the inventor needs to know about the subject. After that period, a check is made by the DM (1d100). The chance of success depends on intelligence, level and the difficulty of the invention, as follows:

The success-modifier is inventionlevel-related. This means that a highlevel character who wants to create a 1st level invention has a 10% modifier.

If the check fails the inventor could spend additional weeks researching. At the end of each additional week a new check is made. Every additional week also implies a 5% chance of sustaining flaws rolled by the DM after each missed success roll. When the check is rolled beneath this number it means that there’s a flaw in the design. When the invention has actually been built the flaw is discovered (perhaps by a massive explosion, by malfunctions or constant misfires, this is up to the DM)

Note that after researching the invention the character only knows how to make it. He just made a building-scheme; he did not create the item. Inventing won’t cost much money (only some ink, pencils, paper and the inventor will need a quiet place and as usual: food)

For example: Spinner, a Gnomish inventor wants to invent the Aiming Device. He is a 4^th level inventor with an intelligence of 18. He has to spend two weeks inventing the thing. His chance of success is

36(int)+20(lvl)-25(modifier)= 41. The DM rolls a 32 and tells Spinner that after his hard work he knows how to make the Aiming Device.

Note that the inventor can’t invent things above his level.

Table II