Hi. This is my first guide so be nice... this guide is for Gragas.I have played Gragas quit alot (and he is beside Rumble my main)and with this build you become a AP-Tank with alot of damage. Good luck and i hope you find this build useful :). Remember that this is a guide i use when i play 3v3. i havn't tryed it on the 5v5 map so I have no idea if it's viable in the summoners rift. If my computer would handle 5v5 i would had made a guide on items that I would use on the summoners rift but because on my bad computer that is imposseble :(. I apologize if my english isn't perfect because english is not my native language.

Many people think you should get Rod of Ages early so you get the most out of its passive, but i think you should be fine with getting it later. I try to get Will of the Ancients early because once you got it you can stay in lane quite long with your Drunken Rage and the spell wamp from Will of the Ancients makes you HP fly up if you throw a Barrel Roll into an enemy minion wave.
If the enemy team have much MR you should buy Void Staff but if the enemy team don't build up MR you should trade the Void Staff with a Lich Bane just for the extra damage ;)
If your game carrys on to over one hour (not many 3v3's do that) you should replace your Dorans' Ring with a Rabadons' Deathcap or a Arcangel staff

A must have
IgniteGreat spell overall, if the enemy is Flash'ing over a wall just Body Slam after them and pop Ignite to secure the kill

Flash
Flash and Body Slam makes gragas "double flash" that is relly useful if escaping/ closing gaps.

Alternative
Ghost instead of Flash

Surge I Don't recomend it but if you want to use it you should trade
Flash for it

Exhaust Don't relly recomend either but because you alredy have a slow from
Body Slam but if no one else in your team takes it feel free to grab it. Trade it with Flash

Teleport I don't recomend it because the twisted treeline is a relly small map. So i rather stay away from it.

Not for Gragas

Cleanse you should not be focust but if you know you are gonna get focust because you teame mates took ranged champions so go ahead.

Clarity Gragas is mana hungry early if you spam your Barrel Roll. But if you use Barrel Roll smart you should be availbe to stay in lane quite long with your Drunken Rage

Smite your not a jungler.

Heal You are probalby not LV 5 anymore

Revive don't even consider it

Promote Naah not relly the best for Gragas leave it to your supports

Clairvoyance your not a support

Pros
-Great damage through out the game

-Hard to gank

-Great in team fights

-Can run through walls

-Good to chase down enemys

-Has great skins

Cons
-Hard to recover from a slow start

-Can mess up a teamfight with explosiv cask

-Quite squishy

-Easy to conter with a stun

I only play 3v3 because it's faster games, easy to gank etc...

Pros with Twisted treeline

-Easy ganks

-You can run trough almos every wall

-Less chans to get a troll on your team

Cons with Twisted treeline

-If that Poppy hits you with a Heroic Charge into the wall it's pretty much GG
same thing with Vayne's Condemn

-Easy to be trapped in a 3v2 / 3v1 situation

-Big chans the enemy team will surrender if they know they will lose

-Easy to ninja kil the nexus <-- can be a good thing too :P

Greater Mark of Magic Penetration

: A good rune for AP champs, cuz there is nothing wrong with MP ;)

Greater Seal of Health

: This guide is a guide for damage Gragas but i think it's always good to have a little extra health

Greater Seal of Magic Resist

: alternativ to

Greater Seal of Health

.

Greater Quintessence of Ability Power

: Standard for AP champions

Thank you for reading my guide and i hope you will find it usefull. Sorry about the english, it's not my native language as i said. Anyways, have fun playing GragasGragas and i will see you in another guide.