Sion needs a buff.
Sion has been in a rough spot for a while, and he needs a big boost, and soon. So I propose the following change.
Not only does Sion make the normal noise when he ults, but his Battlecry and his foot steps are also global when he starts it.
Sion is the Undead Juggernaut. His ult is essentially League's take on this - https://www.youtube.com/watch?v=FoIZIicPlkw
I don't care if it adds more counterplay to him by making his ult more noticeable, I want people to hear my giant man-missile and be scared.
"I! AM! WAAAAAAAARRR!!!"