Problem: need a item for armor and AD and adjustment on Atma
Currently, only Atma's Impaler/Wriggle are fitting to my description. However, Atma scale with HP instead of giving AD directly, and Wriggle is not really effective at late game.
Therefore, I believe there is a requirement for this new AD/Armor items, or maybe just make atma a new recipe.
Unique passive: every 5 normal attack gives target a bleeding effect damage over 4 sec,
350 for recipe
required: pickaxe and chain vest
=> 975+700+375 = 2050
Explanation: a new item which works in mid game, build by pickaxe and chain vest, giving both AD and Armor, and a extra damage effect. But DOT gives you less burst damage to balance the great combination. As for the champion focusing on heavy attack speed, the dot passive could be act just like Teemo's ability. This also gives AS champions a great new choice for improving their damage. Overall, I think that dot damage item is a really cool idea.
The new item is able to upgrade to atma with cloak of agility giving critical chance and HP scale
18% critical chance
Unique passive: gain extra ad equals to 1.3% maximum health
Unique passive: every 5 normal attack gives target a bleeding effect damage over 4 sec
700 for recipe
required: armored blade and cloak of agility
=> total 2050+830+700 = 3555
Explanation: The old atma's AD scale ratio is just too low for player to use it. If we use atma, its almost required player to get a warmog/frozen mallet without consideration, which is too restricted. Atma should be an independent item/viable option even without those extremely high HP item. I believe giving atma some base AD and decrease its health ratio could definitely help (for a 3000 hp champion, this item gives 64 ad which is decent). A 3555 g item also makes it an end-game item, which decrease the advantage of those atma/warmog combination style for mid game, but they will gain the advantage back at the very late game.
Of course, if the new atma is considered too op for bruiser, just lower the hp scale ratio and increase the flat AD. If you think the price is too high, it could be easily adjusted too. Either way, I believe this item will be a great fit for player who wanted to stack armor and ad in the same time, and with further upgrade potential.