User blog comment:Megames1/Against the Meta INVINCIBLE! Plus More!/@comment-5170841-20121004111425

i think the reason why there is a need for items for the ad casters because at the start of LoL almost all heroes had mana. That was the whole point of manamune to be created so the heroes can cast to their hearts contents and get ad for thier efforts. But with the advent of energy and rage, mana seem less obligatory. Thats why there is a need for ad caster items becuase no items seem to really fit heroes like Lee Sin, Renekton and Riven since they cant really on the mana to ad scaling of manamune.

To start of, brutalizer is really impressive example of an ad caster item. Yet it builds into yonmu's ghost blade which is not that all useful when you think about it. Another item that is commonly seen on these ad casters are frozen mallet and maw of malmortius. Yet these two are given consideration becuase they provide primarily AD for the skills and the other stats are given off a bonuses to said AD; That's why you see a lot of semitanks using these items. Lastly, there is Last Whisper which is the only other item that provide armor pen aside from Ghost Blade and Brutalizer which in my opinion is not really worth my gold as compared to the synergy provided by Brutalizer and sort of by Ghostblade.

What we really need is some variety to these ad casters' builds thats why they should add more items are tweak some of the pre-exisitng items.