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Build Guide by Considereth
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Sion: The Undead Champion
Sion is possibly one of the most diverse champion in league of legends, being able to fit into two of the most important roles in the game, namely ap caster and atk damage carry. He is extremely tanky even when not built as such due to death caress shield and farming with enrage, plus his passive. He has an excellent stun as well and his ult is extremely useful in team fights and when pushing turrets. Without further ado, Critical Strike Sion.
Armor Penetration Mark are the only marks you should have on Sion, period.
Dodge Seals because you take 6% less damage, arguably the best seals for any dps champion.
Cooldown Reduction Glyphs are very nice on Sion, being able to spam his shield and stun is the different between kills and deaths in many cases.
Armor Pen Quintessences because we are not building Armor Pen items and need as much as possible in order for those critical strikes to get through armor.
As for skill sequences, you will want to max out enrage first along with using his stun to put you in range for kills and shield for protection.
Grab and a and head into your lane. Focus on last hitting in order to power up enrage. As soon as you have enough, buy . Next, grab your boots which should be as Sion biggest weakest is CC. If they have little to none CC, pick up . The whole theme of this build is to get Sion a high critical chance while being extremely tanking in order to take advantage of his ultimate and be nearly impossible to kill with the correct team support. As noted in the core section, you should complete those first 3 items on sion first as they are the most important in order to get him going. Purchase a to later build into and then you want to build Zeal into . Congrats, you just finished all the damage you will need in order to bring down the pain. Now time to build some survivability and take your place as an offtank.
Ok, so now you need to make a decision. Does the enemy team have a lot of CC and/or Ap casters are shutting you down that you cannot seem to stay alive? , it will mend the problem along with providing health and mana. If that isn't the problem, perhaps you are getting ripped apart by melee/ranged dps? Build , it will allow you to debuff their atk speed and slow them so that you to chase/get away better. If you are doing extremely well, go ahead and pick up .
After solving the survivability problem you want to pick up . Atma's Impaler is extremely good on Sion, I mean extremely good. Sion has a huge hit points pool thanks to enrage if you farm properly along with the items I have suggested. With this, you will be ripping the enemy team a new *******.
The result of this item sequence is: large and often critical strikes coupled with his ultimate results in nice healing for the team along with excellent survivability, Enjoy!