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Build Guide by HexTechCustoms
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Do NOT tower dive
Your r can be a tide turner, use it wisely
You most likely will not be able to kill tanks, stay away from them
stay out of sticky situations for escape is not likely
The magic penetration helps to do more damage output
The cool down reduction helps you use her abilities more often and hence increases the damage output some more
The manna regeneration lets you use her spells for a longer duration which allows you to do more damage for longer
The health makes her more durable which lets her stay alive longer which lets her use more spells which lets her do more damage.
See how this works?
q,w,e,r,e,q,e,w,e,q,w,e and so on (note: you may not be able to keep this up for long unless you have blue buff although archangels staff lengthens the duration quite a bit)
Use your q then w on one group (Close combat or Ranged) and they are screwed (mid-late game, in beginning you need to throw in a few auto attacks.)
Do NOT use your e too much on minions (will eat manna)
Harass with q and w
try to stay a little back (you are squishy)
try to last hit (duh)
Use your r to set up ganks but wait until they are looking at you
look to get easy kills
possibly ask for help getting blue buff
your r gives your team a few seconds of free damage, be sure to use them
don't be afraid to go from lane to lane to get kills and finish of stragglers
After a fight initiates use r for maximum team damage output
spam everything, as soon as the cool-down expires use it, her passive makes consecutive casting cheaper.
Try to have blue buff at all times because spamming can be expensive even with her passive
Use your e only on poisoned targets so you can spam it
Cleanse is also a good choice for escaping
You do not really need exhaust because her w slows and her r is an AOE stun
You do not need ignite because of all the poison
You can go ahead and use fortify, clairvoyance, or rally but I don't see why you should with Cassiopeia
I'm not even going to talk about revive
Clarity is an option
Smite only if your jungling for some weird reason...
Teleport might be a good choice because she is rather slow