Board Thread:General Discussion/@comment-6192846-20150223174230/@comment-6192846-20150316182348

I've already said this in the Gift thread: The decay refers to magic. Elluka speculated that her connection to Lukana's body might be decaying, not the body itself. Her magic was getting considerably weaker after nearly 500 years and considered the possibility that she may not be able to remain in the body in the unknown future.

Based on that, it shouldn't be affecting her ability to walk, especially since Lukana's body doesn't get traded out by Ma for another 200+ years.