Your goal is simply: slow, slow, and more slow. Your job is to kite for your carry, as they obviously can't do it for themselves. With this build, you will transform into a super tanky tower that fires autos that apply over 50% slow to over 3 targets per fire at astounding speed.
The enemy team will feel as though they are always walking through anivia ult or into never-ending thresh boxes and are left to the mercy of your team. Late game, with over 3200 hp, 1700 mana, 335 armor, 95 mr, 40% cooldown reduction, 32 ap, and 1.73 attack speed, you will become the ultimate nightmare of all those who opposes you and be a legend among adcs.