To all space explorers, rogue traders and Federation colonisation and expeditionary force officers!
Thirty new alien species have been discovered. You are well-advised to inform yourselves, as to engage these entities correctly, without risk of harm to yourself or to the interests of Terra.
Ten of the described species are human in origin, yet modified to such a degree that they no longer need to be considered human.
Another ten are civilisation-building aliens competing with Terra for available space.
The final ten entries are remarkable life forms that display sapience, without using it to create civilisations. Caution is advised.
The PCs are setting up camp at the end of their first day of walking through the Esh-Inel Mountains, when they hear in the distance a low rumbling, like thunder. It grows progressively louder until it echoes off the mountainous bowls around them, then dies away again. At its worst the ground starts trembling. It happens every day at this time, and it is the noise of the Great Carts on the dwarfish underways returning home after a day mining, laden with many tons of ore.