Collector

The Collectors were amorphous creatures. They obsessively collected items that appealed to them.

Technology
The Collectors travelled the galaxy in five-mile-wide cruisers made from planetary debris, which moved into orbit around planets and released swarms of short-range fighters. Their ships used Hyperwobble drives. (EDA: The Slow Empire)

Reputation
The Collectors were apparently feared by many races. Hearing rumors that Collectors were present near their system, the Daleks actually disguised Skaro to make it appear abandoned. (PDA: Heart of TARDIS)