Beyond the fact that Corvana wielded no visible weapon anywhere on her body, it wasn't every day that you saw a 'sheathed blade' with hair like platinum in ways besides color. Much less an accompanying head, limbs, and torso! Yet there she was, violet eyes peering over the waters. However, she was only half-wrong. Ishtalle took on many forms in the past, swords among the more numerous. Though today, as she floated there listlessly she appeared more tinker bell than Excalibur, yet sharper still. As if to complete the cosplay, her blade-wings even gave off an effervescent glowing dust as they beat the wind behind her.
                                     
There was a splash as Corvana and  familiar leapt from their high-rise and into the shallows of the shore. Her shiny wizard eyes could ascertain several things about the newcomer. First, she was using barrier magic or a close derivative. She could work with that. Secondly, she either  had powerful divination magic or psionic ability, the latter more probable, given scrying and divination spells were all but useless against the doctor-mage. With an idea of her opponents disposition, she resolved herself to her decision.

"We are here to do whatever it takes to leave this place.  Exits only present themselves when a single warrior remains standing. So..."

She didn't feel like using Ishtalle, but she wouldn't need to. With some creativity the very earth and air became a weapon in the hands of a genius. Her hand swirled and popping cyan was spat into the environment as an aerogel mold twice her size conglomerated before her, stabbed unceremoniously into the shallow waterbed. It was absolutely huge! So huge, in fact, there would be no way her dainty hands could possibly grasp it, yet she was determined regardless. As her hand reached for what would eventually be a sashed hilt, excess material and imperfections were melted away and scattered into a mist of nitrates and salts. What was left behind from the metamorphosis was a steaming, glorious lovechild between a javelin, screw, and blade encircled by the remains of a diamond shell. Its six-foot rainbow lance bore winding rivets, the base expanding outward around the hilt to protect hands. 

As she grasped it the diamond circlet collapsed onto the sea floor, and she snapped her elbow forward as she rested it on her shoulder.

"I'm ready."