Best stand alone ap damage item?
I was wondering if every champion would build one damage item what would it be? for AD champions I'd think it'd be black cleaver/triforce because those are typical bruiser items, but what gives ap champions the most damage out of one single item?

is the most well-rounded AP item we have by far — 20% CDR, 100 AP, 400 mana, restores 20% of maximum mana on kill/assist, applies grievous wounds to champions below 35% HP for 8 seconds.
or
can give a huge increase in dmg if the enemy has > 70 MR.
Good for squshys, burn for tanks. Health since you're probably going take with just 1 item and make tank.
If you have good base damage + tank stats
Like thats gonna hurt lol