Petra is glad to see you, as always. She takes the note you found in the Menagerie and puzzles over it.
"It's very odd," she says eventually. "These are instructions to find an Earthmade Rocket Launcher hidden somewhere in the Prison of Elders. The grammar's not very good, though. It almost reminds me of Eliksni…"
She translates the note for you, and then, with a weary apology, she returns to her endless field work.