.Back in the day, ace in hole used to proc on hit abilities,
So massive ap+ lichbbane cait scored one hit kills on teemo all day.
Muffin traps hit hard with ap!
This sounds retarded, why would you go AP Cait and Lich Bane when you could go AD Cait and go Trinity Force? AP Cait now would need a Nashor's Tooth and probably Wit's End and then DFG, Gunblade, Morellonomicon and then w/e boots.
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Runaan's Hurricane can be decent on ranged bruisers, in teamfights they just do so much damage. Quinn, Teemo, Kayle can be pretty deadly in team-fights if they build a little bit tanky. For bot lane champs then it's deadly as hell with Twitch, so much poison for his expunge to just go crazy, a well timed ambush can let Twitch 1vs3 a team without having to use his ulti with Runaans. I want to try it on a tanky Urgot top though, apply his passive on enemies in a teamfight reducing damage 3 champs do by 15%, that could be enough to win teamfights.
Lich Bane does more than Triforce by a ton, since Lich Bane dealt 100% of your AP back then. So, Lich Bane + something ridiculous (700+ AP) for maximum damage.
And, seriously, please don't buy Runaan's. I'm telling you that you simply do more damage by building other items. It may seem like a good idea, but that Runaan's is taking a very valuable spot in your items, and not giving you much in return. It might work in some cases, but you're typically fed enough that it's not usually the item helping.
Kog'Maw good to take aspd on, good, I like stacking aspd. hithithithithithithithithit
Although this leads to another question, how do you determine when a character is good for stacking aspd as opposed to attack damage? For Kog'Maw the W has percentile damage so I get that, is it just when they have a particuclarly nasty on hit effect?
And another unrelated thing, spirit stone items (spirit of the ancient golem etc), I've heard they're good for pretty much everyone, is this true? I enjoy having high regens, so this is fairly relevant to me.
Actually, this is a good question. The easiest way to figure this out is to look at their skillset, and I'll show you examples: Caitlyn, Graves, Tristana, and Vayne.
Caitlyn has two very powerful AD skills, a passive that deals 150% damage after a number of shots, long range, but no steroid. This allows her to function very well with building more AD than AS. Her midgame falls off because of this, since she has no built-in steroid to balance her out, she'll be lopsided one way or the other, but in the end, she'll end up with a fair bit of both. Typically, grabbing a Bloodthirster first on her will allow her to deal good damage with her Q and R, whereas grabbing AS first... well, doesn't help her much on anything. Her late game is great though, since that damage booster and range is very poignant in the late game.
Graves has two very powerful AD-heavy skills and a built in AS boost, but short range. Since he has a built-in steroid, he can typically cover his midgame pretty well, building straight damage until he really needs his AS. However, he falls off late game, since he's a shorter range ADC.
Tristana has zero AD skills, an AS steroid, and a scaling range. Since Tristana has zero scaling, most of her early game damage is magic. Her burst damage is quite fearsome early, but midgame, she has nothing because of this, since none of her skills scale with AD. However, because she has that great AS skill and scaling range, the later in the game she gets, the better AD is on her. Early on, she's sort of underpowered, since she really needs those items, but when you see a 6 item Tristana, you're probably going to die. Tristana's early and mid game are garbage due to this, so... it's really a matter of preference. While you're certainly free to grab BotRK, grabbing IE is not bad, since she's an AAer.
Vayne has one AD skill, one AA booster, one on-hit ability, and an AD steroid. Vayne is... scary. That's all there is to say. Since she has no real way to poke someone with skills, she relies completely on AA. This is meant to make her very vulnerable in lane, as an ADC with poke should be whittling Vayne down while she tries to farm. Unfortunately, while this should make her weak until late in the game, Vayne's ultimate sort of evens the playing field, giving her an AD boost to her skills. The on-hit is more for tank-busting, but still helps kill targets, and her AA booster is immensely powerful. What does that mean for building on Vayne? Well... everything, really. She is actually okay with building both. Her ult naturally boosts her AD (not by much, but it's still something), so some AS is good, but her tumble naturally boosts her AD by a percentage, so some AD is good. And since she's on-hit, you'll typically see a BotRK as her first item, giving her, again, both.
Overall, this just means, you know, look at what your character scales with and think, but when in doubt, build damage if you're a carry and health/resistances if you're a tank.