Su Chang'an transformed a sword he favored into his Lifebound Sword through a contract.
As a cultivator not yet at the Spirit Mansion stage, he couldn't forge a contract with an Immortal Artifact without external assistance.
Fortunately, since he was invited by Jiang Tang, this minor issue didn't require Jiang Tang's personal help.
The Ice Crystal Palace assisted because its materials, including the sword, were made with ice crystals and other materials.
When used, it possesses the ice attribute.
The Lifebound Sword is nurtured within the body, and although Su Chang'an didn't previously have an Ice Spirit Root, he needn't feel discouraged.
After learning the All-Around skills, his ice-root powers, though not initially strong, improved continuously as he entered the Ice Crystal Palace and became an immortal.
At this moment, he had already transformed into an immortal, summoning the Lifebound Sword before him, to be contracted and nurtured within his body!
