After gunblade get sheen and then lichbane then rageblade imo lichbane works better before rageblade cause it gives suchs a high burst with gunblades use, you dont even need the boost for your ultis passive when you burst the enemy down before getting even full stacks.
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gunblade ... rageblade
You've been pretending to disagree with me this whole time and then you yourself list the 2 non-boot core items I named among your 3 core items. I respect that you take lich before guinsoo's, and I disagree but that's fine but... do you just want an argument, or what? That's not nearly as big a difference of opinion as you've been implying.

It's the most important for anyone. If you're still auto-attacking minions during the laning phase, you're bad.
I'm always eager to dispel this myth. As long as the minion will not die to your minions/turret before your autoattack refreshes, you should be attacking. This causes your last hit to arrive sooner, it helps you direct the loss of health of the various minions so you have a chance to last hit more of them, and it applies lane pressure, which is totally under-rated at lower levels of play because people are bad at ganking. A pressured lane is one that people can't leave, which means they can't go gank anyone and will even have a hard time recalling when they want to if their HP gets harassed off. It's better to last hit than blindly autoattack, but it's way better to autoattack and stutter when the minions get low so you end up with the same number of last hits so that the wave clears faster. This is slightly less critical now that minion dmg to champions has been nerfed and you can more safely harass through minion waves, but it's still relevant because of the ganking thing. There is no such thing as "pushing too hard" unless you are exposing yourself to a jungler gank for not enough benefit, which is basically never if you're in a 2-man lane (read: at least half of the laning team) with proper ward/cv. Even when you're hanging back, you basically want to obliterate the wave instantly, and then you can focus on harassing the champ back to his half of the river or even sneak away for a quick jungle camp or recall for shop/heal - things you can't do if you liesurely poke last hits and hide the rest of the time.
I want to stress this:
this game is not so poorly designed that you can avoid all risk and end up with a great result. This is from someone who lanes smite and CV and has 21 per-level runes and all the gold masteries. I am as cautious and passive as you can possibly get, but I recognize that it has downsides and I have made my entire LoL playstyle out of learning to stick my neck out into the lane and farm up as safely as possible without escape spells. With skilled players, just hiding at your turret and avoiding all danger only works if it looks like you're going to feed and no one is available for a lane swap. In this case you are admitting to yourself and everyone else that you are doomed to probably be the team's weakest, most underfarmed player, and that staying in that lane is only worth it because of the success your team gets in the other lanes as a result of you taking one for the team. Like
rope-a-dope, you're taking a beating and that's that, and hopefully your team will win the other lanes more than the enemy wins yours.
Dr. Mundo is not AD. If you actually manage to build up enough AD items that he does more AD than MD, you have ruined your mundo build. you should check the damage dealt stats at the end of every game; not only is the "total damage dealt" stat probably the single biggest indicator of performance for most champs (if you have to pick just one number, that is; inb4 people turn my statement into an absolute), but you can learn very quickly what kind of damage champs are actually dealing by looking at their graphs for a few matches with different builds.
Here's a list of champs that make good AD off-tanks. Many of these can be built as assassins, main tanks, and other things; that doesn't mean they can't also be built as AD off-tanks, and please nobody start an "um, actually.." war over this list just because other builds are more common or in your opinion more viable. This is just my personal take.
- Blitzcrank
- Irelia
- Jarvan IV
- Lee Sin
- Malphite
- Master Yi
- Nocturne
- Olaf
- Renekton
- Trundle*
- Tryndamere
- Udyr
- Warwick
- Xin Zhao
- Yorick
* I've always felt that Trundle is underpowered and there's really no reason to ever pick him. However, this opinion is very controversial, and if Trundle can be anything, he sure as heck can be an AD off-tank.