Aliens & Artifacts finally brings two important aspects of scifi gaming to the Spacemaster universe: Alien Beasts and Alien technology.

A&A includes:

• 14 fully described alien sentient races
• Nearly a hundred alien beasts grouped into eleven different ecosystems
• Dozens of artifacts, ranging from time warping Entropy Neutralizers to deadly Singularity Seeds
• Detailed character creation rules for each new race
• Dozens of adventure suggestions and world descriptions
• Rolemaster's Claw Law supplement, which is used to quantify the inherent attacks of A&A's alien beasts