Oblivious to biological life, the Tan Ru are intelligent machines spreading across the Purple Void nebula dissecting and analyzing everything they find, collecting data for some unknown purpose. They are oblivious to biological life except when it can be used for raw materials. Rather than being ships inhabited by crew, Tan Ru spacecraft are sentient mechanisms designed to scout star systems and beam data back to where they came from. Over time they have absorbed many exotic technologies that they can use in combat.
Tan Ru drones are fragile and easily destroyed, but anything larger means trouble. Flee if you can. If you can't, stay as far from the Tan Ru as possible and use long-range weapons. Send your fighters even further away, as they're extremely vulnerable to Tan Ru weaponry.