Lilith wrinkled her nose, distastefully.
"What exactly is it?" she demanded, imperiously.
The Captain of the Guard swallowed, nervously.
"We're not sure, m'lady, but we found it in the swamp diving in the pools and looking a bit lost, and muttering something about where all the dead Elves and Men and.... erics? had disappeared to. You did say to report any manifestations to you."
Lilith Weatherwax looked it over. It certainly didn't look like any species known on the Discworld. But it stirred a vague memory, all the same.
The humanoid, bug-eyed and vaguely frog-like creature looked back at her and blinked.
"Ello." it said. "It's my birthday!"
"Happy birthday." said Lilith, the cold harmonics of her voice making it sound like "I have a red-hot poker".
The clicking of the magic wand echoed to Gollum's ears like the footfall of a Nazgul in the marble halls of Barad-Dur. But some final tiny nucleus of sanity in Gollum's mind said that at this moment in time, he'd have preferred to confront a Nazgul of the Presence.
"You don't belong here" Lilith said, with finality. "You're wrong for this tale. It's best you return to your own. Goodbye!"
Energy zapped from the wand and enveloped the creature. A stream of dark actinic light arched towards the circle of mirrors, bounced between several as if seeking an exit point, then vanished.
She exhaled.
"I absolutely HATE crossovers!"