Considering that he can be hit by all other forms of CC, it seems weird that he cannot be polymorhped by Lulu. I'm assuming this is unintended, but in case it isn't, Sion's passive should at least mention that it makes him immune to cuteness in the ability description.
leesah1 votesHi, I tested this in game and was able to polymorph Sion's passive state. I'm not sure if it's a one time occurrence or if their are more variables, but just wanted to let you know that polymorph does work on him.
Platicopter1 votesGood to know, thanks! It must have been something specific to that game. I tried it 5 or 6 times throughout the game, and it never worked. Maybe one of the items he had was causing the bug (it was a jungle Sion).