This is a nice addition to a DMs collection because it deals with something rarely covered in any other published material - river travel. There are plenty of stuff for sailing the sea but everyone seems to overlook that there are inland bodies of water as well.
Legion aims to correct that with this short little trip down Blood Gorge - a simple trip, surely the name is only local superstition right? The setup is minimal where the only requirement being that the PCs need to get somewhere and the river would be the quickest route. They'll have to deal with bandits, rapids, waterfalls and a freakish river tidal wave.
A nice little system is also included for damage to small watercraft and how to measure (and bail) water flowing into the boat. I won't say that this is a must-buy but it certainly can add an element of a new locale for adventure into your campaigns.
[4 of 5 Stars!]