'Well, my dad is very supportive of any anti-Ministry action! ...He's always saying he'd believe anything of Fudge; I mean, the number of goblins Fudge has had assassinated! And of course he uses the Department of Mysteries to develop terrible poisons, which he secretly feeds to anybody who disagrees with him. And then there's his Umgubular Slashkilter —'
-- Luna Lovegood (OP18)
Something that Luna believed Cornelius Fudge had during Harry’s fifth year. We’re assuming it’s a creature of some kind because of the context, but we’re not absolutely sure… (OP18).
Luna describes how her and her father, Xenophilius Lovegood, are supportive of anti-Ministry action, which leads her to explaining many interesting things they believe about Cornelius Fudge to Harry and his peers at the Dumbledore's Army meeting.