Endures a blast from Leia's heavy rifle

Leia Organa reached the top of the pinnacle, lay down across it and positioned the heavy rifle she'd
retrieved. She fought to focus on a single, black-clad figure striding relentlessly and without panic up
the tunnel. Vader was surrounded by Grammel and a few remaining soldiers. She couldn't wait. Soon
the Dark Lord would pass from sight.
As she activated the trigger, Vader turned and gestured to the several troops lagging behind. A
powerful beam of energy struck him in the side, sent him spinning to the ground. Leia smiled. Her joy
turned to disappointment when she looked back through the blunt telescopic sight.
Vader had rolled over and was beating at the smoke issuing from his left side. There was a gaping hole
in his protective cloak and the black armor beneath had been partly melted away. But the full force of
the energy bolt had missed him.

Splinter of the Mind's Eye, Chapter XI, 109