Small sion buffs
can sion get some minor buffs to his base stats and passive
+1 armor per level
An have the passive reset item passives and actives so sion can use them again in his passive form.
For example 
Its nice he can use items during his passive but he needs to die first to use his passive as a tank this is a bit silly. The passive already becomes weaker and weaker as the game progresses. The base duration already is cut in half by simply leveling up. Then there is also the fact that everyone becomes more mobile because of how many item grant movement these days especially carry items. And like i said you are the tank so you do not easily die as nobody actually wants to hit you.
What this does is your item actives and passives are almost always on cooldown during your passive frenzy state because you cannot just safe them because you mioght die that would be dumb you want to win fights provide utility and stay alive.
By allowing this it would help buff the passive when certain items are bought.