From publisher blurb:
Remarkable Races is going beneath the waves in a new series called "Remarkable Races Submerged." These new racial supplements will add an aquatic flair to our beloved Remarkable Races line, transforming many of your favorite races for use with the Cerulean Seas Campaign Setting, as well as introducing a few new ones.
What do you get when you cross a caveman with an ancient killing machine from the Devonian Age? You get a brutish proto-merfolk known as a mrawgh! In this 5th chapter of the RRS series, we take the Mahrogs of Remarkable Races' fame and re-conceptualize them under the waves. So if you ever pined for simpler times, it doesn't get any more primitive than this! Of course, the mrawghs follow the same great format as the other races with colorful original art, complete rules and extras, and are ready to play immediately.