Sion's a fun champion to play but underpowered. I have several questions and feedback.
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I would really like Sion's abilities to have all AD Ratio's. AP Sion's now even more gimmicky than ever, you just sit back and poke people with a 25 mana Roar of the Slayer when lane minions arrive, and you walk up to them and explode them with a .40 AP raito shield. Not nearly as effective as he was before. You can't build AP item's on him anyway, the two viable ones being the 2 spellblade items not named Lichbane. Spellblade Item's aren't an effective buy on him because his shortest cooldown is 6 seconds on his Q at max rank. And due to how Q works in the first place via charging it up, it's just not a practical source of spellblade ability spam damage.
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Variable mana costs on his Q would be nice. It should cost very little mana to get a quick Q swipe, then variable mana costs depending on how long the ability is charged for.
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Roar of the Slayer doesn't seem that useful. You max this ability last, and it's not very good for one point. The 20% Armor Penetration is actually not noticable at all because sion can't afford to build enough damage to make use of it. This will change however if you take my first suggestion and give him AD ratio's so that building damage is a bit more meaningful. But if not then I think this ability needs to be more useful at 1 point. He also deals a fair amount of magic damage. Maybe making Roar of the Slayer also cut down some magic resistance?
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Sion's Soul Furnance is actually really awesome to use. It works well from the jungle. I max this first most of time. It's sion's only reliable source of meaningful damage.
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His ultimate is too easy to avoid. I've seen bootless Anivia's dodge it when her wall is on cooldown. Increase the maneuverability of his ultimate by a little bit so that when you properly time the ultimate when the enemy doesn't have their mobility CD's up, and aren't innately fast, and you are aiming at their face, you hit them.
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I think my biggest issues can be summed up as damage items not being valued at all. And because of that you're pretty much stuck building full tank + just trying to disrupt people with Q and R. But he can't disrupt people that well because his Q and R are super unreliable to use (way worse than cho'gath is). So you're stuck just spamming roar of the slayer on dudes attacking your squishy's or the enemy squishy's.
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I get that sion's supposed to be unreliable and cumbersome and just zones people. But I think you went a bit over the line here on that. Make building a damage item or two valuable. AD preferably. I also don't think Sion's Q gives him a good area in which to position himself. I think the shape of his Q needs to change a bit more so that positioning matters better to sion and his enemies.