Hey all, this is my first guide, where i will show you how a real Sion works (in my opinion). I will build him a mix of Attack Speed and Crit, so if you're planning on making him AP please read the guide through so i have a chance of changing your mind. :)

If your laning partner doesn't have any disable or cc abilities i suggest you pick Cryptic Gaze as your first skill. Now max Enrage and pick only Death's Caress 1 time, the skill is only if you're running for your life with a Ignite in your ***. After maxing Enrage, max your stun for CD reduction.

Pros:
- The stun.... OMG the stun. Everybody fears it. 2 sec at lvl 1!!!!!!!!!
- The damage he puts out is extreme, +65 dmg at lvl 9? Take that you gay-*** B.F. Sword.
- Hes the ultimate teamplayer. His stun and his ulti. After an encounter your team will have 100% hp... because of YOU!
Cons:
- The other team will focus you, because of the reasons above.
- Cant find anyone else...

I grab a 21-9-0 spec for some awesome damage plus crit chance and crit damage. The points in the Defense tree gives me the Nimbleness effect which is extremely effective with the Greater Seal of Evasion in my rune build.

A little explanation of my rune build.
Greater Mark of Critical Chance: This will gice you a lot of extremely mean crits early game, and will give you a lot of easy firstbloods.
Greater Seal of Evasion: Sion is hard to take down, but he's not a tank, and some survivability will get you a long way.
Greater Glyph of Magic Resist; Look above. :)

The ones i use.
Cleanse
Exhaust
I take cleanse, because (in ranked games) when Sion activates Cannibalism he'll get CC'ed. And Exhaust because i think it's the best summoner spell in LoL, and if you should meet a feeded Tryndamere who wants to chop you up, he'll get raped by the "Choppa". Without having a chance of scratching your pretty green skin.

Ghost Is an awesome summoner ability for Sion when he's running down a bleeding Tristana. But as soon as you play ranked, you will need slot for Cleanse.

Flash Well, what the hell. Everybody loves this spell so why shouldn't you? "A flash, a stun... the rape is ON!"

Star out buying Brawler's Gloves and a Health Potion After this, rush Executioner's Calling. This item i SOOOOO awesome against Dr. Mundo. When youre nailing him, and he thinks he can turn the fight by using Maximum Dosage, he's wrong. It's so effective against a lot of champions.

You have to analyse the enemy team, for the right pick of boots. If there's almost no CC, get Berserker's Greaves if there is Mercury's Treads.
Now get Phantom Dancer.
If you think your victims are getting away to easy get Frozen Mallet and watch them cry as they try to run away from your big-*** axe.
Dying to often? Guardian Angel if not... get Infinity Edge and another Phantom Dancer

Sion is such an awesome champ, and you'll be so happy that you picked him, because you 2 will have so much fun raping the other team. Hell i've been 1v3 and walking away unharmed and with a triple kill.
I hope you could use this guide. And for the love of god... rate and comment, or a big, green, undead, raping machine will tear you apart. :)