"My grappling hook launcher, made to look like an umbrella."
|First appearance||5 Days a Stranger|
|Found||Obtained from start|
The Grolly is Trilby's signature tool, a device of his own design. Within its umbrella exterior is a grappling hook, capable of carrying a full grown man, and a powerful taser. While the taser is only seen in Trilby: The Art of Theft, a departure from the Chzo Mythos series, Trilby makes use of the grappling hook to enter the DeFoe Manor at the start of 5 Days a Stranger and once more during said adventure to swing from the window of Sir Roderick DeFoe's bedroom to the window of son's bedroom.
- The name "Grolly" comes from the combination of "grapple", the device's main function, and "brolly", British slang for umbrella.