[Blatimus]

Originally Posted by IshMEL

I think it's in the SoTM rules?

Found it, SoTM Master Game Guide on page 11:

• Line of Sight: To attack a targeted figure, your figure must be able to "see" it from its location. Unlike Range, the Line of Sight is an imaginary straight line between your attacking figure's Target Point and the targeted figure's Hit Zone; it has nothing to do with the spaces on the battlefield. If the targeted figure is (for example) behind the Marrow Hive or a cliff, so that your figure can't "see" it, then no attack is possible. The only exception to this rule is if a figure is engaged with or adjacent to another figure. A figure does not need Line of Sight to attack a figure that it is engaged with or adjacent to...

Thanks IshMEL! Always good to know the specifics.