I'll cast Fly on myself, Kauper's Skittish Nerves (+5 on initiative), Tongues, and Haste.
"Okay. See ya guys, gotta run, back soon, gotta run, see ya, back soon. Making friends with griffons, lotsa friends. If I scream, please help. Help is good. Cast those spells Arty, cast 'em good."
I'll fly carefully to the edge of the Nexus' wall and fly up and peek inside. When I spot the ugly beast, I'll hit him with Charm Monster.
[Will Save, DC 24].