Champions

[Mr. Zhu]

So... I bought Sion....

Heard he can be AD/AP?

How do you build both of these? What skill do you get and max first?

Mastereies? RUnes? Tips?

Standard caster runes/masteries.
Standard top lane bruiser runes/maseries.

Caster Sion: R>W>Q>E
AD Sion: R>E>Q>W or R>E>W>Q

Caster Sion build: 2 Dorans, Sheen, Boots of Mobility, Deathcap, Sheen -> Lichbane, Void Staff then situationals
AD Sion build: 2 dorans, zerk greaves/boots of swiftness/boots of mobility/merc treads/ninja tabi, two zeals, Infinity Edge, Zeals -> Phantom Dancers, QSS (100% must), GA or Atmas.

AD Sion requires a lot of last hitting to become amazing. AP Sion is very easy to farm as. Basically once you get your Needlessly large, you can blast through an entire wave of minions.