Say "Great Shadowmaster, help me!"

The moment you say the words, the sword’s hilt grows cold, then erupts in tendrils of living darkness. The shadows cover your body like a second skin, smothering the light, muffling sounds, and even neutralizing the scent of your fear. The goblins can't see you, and they continue their useless efforts to track you.

"Pathetic worms" the sword’s voice talks into your mind. "They couldn’t see through my cloak of shadows." A tendril flicks out, snuffing the torch of a goblin. The creature is frightened and starts to run screaming in panic.

You move unseen, carrying the egg, and after hours of travel, you finally arrive at the Green Mountains.
These majestic mountains rise like stone giants, their peaks reaching the clouds. Carved into the mountainside you notice a cave with a dragon head carved in the stone. This place is filled with ancient power and magic.

You did it, the stone it's close, very close, and your map starts to glow.
At this moment, you have a few options.

You can enter the cave using the powers of your magic sword, and find the stone without contacting the dragon.
You have the egg, you can try to persuade the dragon to give you the stone.

Both options have their risks.