Tin-Foil Hatter
Uncommon24.5%ObjectiveOptionalAnywhere
Triumph over a martian invasion, when beings from out of this world come to scramble your brains and probe you in uncomfortable places.
Post-Golem, Martian Probes spawn in the outer thirds of the map (commonest in space) - let one see you and escape, and the Martian Madness invasion begins. The Saucer boss is the event's real fight; a roofed arena neuters its deathray. Beat the event to 100% and it pops, with the Cosmic Car Key and Influx Waver among the spoils. If probes won't show, AFK on a sky bridge near the world edge with a water candle.