Use jack in the box to protect ur adc and ur lane. The boxes are your main source of wards, placing 1 in river and one between river and lane will slow down enemy ganks. In the late game this skill will be your ward, use it often. If your team wants a team fight or when your going to attempt to take an objective, setup boxes in advance, you should two or 3 in that area. Two shiv poison: use it once or twice, at level one to harass and save the mana for when you really need it. you can start harassing when you put 2 points into it. The main thing is to not let this skill waste all ur mana. Have at least 50% for emergencies. The only use for decieve is to escape, which is why mejais is good for this build, keeping you alive so you don't lose any stacks. This build revolves around mejais. You will obtain stacks really fast from ganks or lane kills which will boost the damage of ur shiv, making it's poke super effective in the early game.

The point of this build is to gain the passive effects of mejais which will help you in the mid or late game. Gank mid, but make sure you can do it without leaving your adc at a disadvantage in bot. Sweep bot lane to get ur jungler and adc fed. Late game prepare boxes in advance. For example predict enemy team's plan or , form a plan with your team, if attempting to take an objective or fight a team fight. have boxes in advance for that specific location. use wards in mid and late game. With such high ap, you can attempts to split push. make sure you have an escape route of boxes to help u escape and pay attention to where the enemy is. gl hf.=D

Sweepers, is to help your jungler gank bot easier, use it only when you are trying to get a gank. In the late game always be on the look out to clear wards, and always place vision wards if it is taken out. As for shoes, grab them because they make you fast, but becuz you have mejais, i usually dont grab them. I recommend all grabbing the most ap out of your items with cdr.

you will have kills so bounty hunter is a must, especially with the high damage from mejais, assasinations will be simply easy to pull off. Deathfire is optional, but it really helps if they are at 20 hp. with base ad and your high ap from mejais, deathire can be very useful.

for runes, grab enough ap for early game and scaling to give you a large boost in the late game.

anything =DD =)