Hi, I know developing game based on the universe which belong to the company that doesn't allow to use their products isn't legal but I wonder how much inspiration I can gather from this kind of games. Here is a thing that I consider. I would like to use the same defense, attack types and races that appear in warcraft 3. No more other references to characters, world or story. The only thing that I would like to create is a combat simulation based on the same rules that are present in wc3. I know races like orcs, elves or humans can be met in any other games. Also armor types divided to heavy, medium, light and so on looks pretty universal. But I would like to be sure that this kind of combination where both, combat rules and races, referring to the same game, will not cross the line.