-Harley Quinn
So with this guide you are building lots of will, including her healing skill you are meant to be resilient and stay in the points for a good time. Early game you should be careful as you are kinda squishy, only until you finish the first items that give you will, cooldown, and a good healing rate with your E, therefore you are capable of building damage while helping your teammates out.
The Atlantean Seal will make you harder to kill and you will be able to poke the enemy while fleeing from them and considering that your skills and passive will always help you out of trouble or chasing enemies with attack speed and move speed.
Always be aware to use your skills, specially E that will get the most out of your passive for everyone. Later game you can keep building PD, Will or any armor you need. Later on you can keep skipping and killing with her. GLHF
-Mods
Abin´s Sur Lantern- Will Harvest
Eye of Ekron- Will Force 2
Cosmic Staff- Desintegration 2