Re: [Basic] Advantage of the Week: Amphibious, Aquatic and Semi-Aquatic
 

Note that Pyramid: Underwater Adventures is written in such a way that the effect of Amphibious and Aquatic on skills is more-or-less ignored. Which means you read Basic Set, see the trait, figure you want to know what the skillwise advantage of amphibians over non-amphibians is . . . and don't find it once you read the Pyramid.
It seems to me like one of those cases when a non-Basic supplement is written without making it 100% plug-and-play with Basic.