This is my first build, but its worked our fine for me so far. Give it a try and see what you think.

This build is ment to become and offensive offtank lategame starting out with building on dmg. With mordekaisers shield and some defense he becomes verry hard to kill if played right.

As for my choise of runes, this setup gives you decent AP from the start, as well as some decent armor.

As for the items, i personaly start out with the dorans shield and go for the book as soon as i can afford it for that extra AP to put some presure on your lane. So as soon as you have 435 recall to get the book since you have teleport you will be back in just seconds and wont miss out on any xp if timed right. Ive used this build for all lanes without any real problems. If you build the Boots or the gun first is optional and should be decided depending on your opositions way of playing. But boots are usualy the best way to go.

When it comes to the Deathcap and GA these 2 items are the items that varry pretty much every game for me depending on the oposition. If the team is heavy on AP i usualy skip the GA and build a force of nature instead for more Magic resist.

As for the masteries, these are good throughout the whole game but especialy in earlygame where the armor/magic resist does alot for you. The rest need no explination imo, its for dmg.