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The top of his staff used to glow red, but was changed to purple in an update.
For a brief period after the Battle of Lumbridge began, Soran vanished from his post in Varrock. This glitch has since been fixed. A Jagex Moderator claimed on the forums, that Soran had simply taken a holiday to Oo'glog Recreational Relaxation Resorts in the VIP section that no one else could access, while addressing the glitch. During this time, the only way to contact him was through the banner of Zaros.
It is possible that Soran has the ablity to influence the Shadow Realm, as he could only be seen with a ring of visibility or Sliske's blessing on Tuska's back during the Tuska Comes world event.