AP Sion build with runes and items. AP Sion guide offers in-depth how-to play, skill order and tips. Play AP Sion build in League of Legends Patch 25.S1.3!
Playing AP Sion build, your default rush is Hextech Rocketbelt.
Adapt to an enemy team. Are they full of tanks, and they rush tons of Magic Resist? You rush Void Staff as #2 or #3 item to counter MR stacking. Their team has champs with lots of healing? Rush Oblivion Orb as #2 item (upgrade to Morellonomicon as 4th or 5th item).
Somebody is going after you each fight? Always getting ulted by enemy assassins? Rush Zhonya's Hourglass.
Champion
Your main poke combo is cast W + wait for W + Hextech Rocketbelt + W explode + E or Q + auto attacks if possible.
Your going-in combo is cast W + R into an enemy + W explode + charge full Q + auto attacks / W / E if possible.
This build scales best with Magic Penetration, since your AP scaling is mediocre.
You can optionally max E > W > Q or even E > Q > W, adapt to an enemy team.
Tips and Tricks
Champion
Remember that your Soul Furnace (W) does % max HP, making it pretty good ability to execute your enemies. Wait few seconds so you can explode, combine that with Flash and you have a nice combo to finish off your enemies.
You can combo Soul Furnace (W) with Unstoppable Onslaught (R). Pop W, wait a second or two, then use your ultimate. Detonate W when near your target (you don't even need to hit your R) for maximum damage, or when you land your R.
Riot
You only have very slight turning ability during Unstoppable Onslaught, so make sure to use it in straight paths.
Roar of the Slayer is a great setup ability to land a very powerful Decimating Smash.
The Soul Furnace buff displays how much shield strength is remaining, use this information to time its explosion perfectly.