The one thing in the universe that can scare Darth Vader was the one thing in the universe that could scare Darth Vader. Its nature as a Soviet Russian from Hell allowed it to accomplish this rare feat.
The one thing in the universe that can scare Darth Vader lived inside Darth Vader's nightmares. It enjoyed haunting him regularly, resulting in frequent emotional outbursts and sleepless nights for the Dark Lord.
At one point, the one thing in the universe that can scare Darth Vader met Vader's rejected Sith apprentice Tira and raped her. The two fell in love and got married, and tortured Vader for years to come. They had a Shitspawn child, Darth Gollum, who Tira trained as an apprentice.
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