Basically i built this anivia so that she can just drop bombs on people constntly without them touching her

She does have low health but the nuking makes up for it.

It was a long time ago but the best game i went with her was 27-7-10 with this build

BTW constructive criticism is always appreciated!

PROS
-does soooo much damage with her spells
-good carry
-good farmer and creep killer
-shes able to take out multiple targets
-great nuker

cons
-low health but thats what heal is for
-mana runs out very quickly without clarity
-not the best killer early game but still alright
-get kills taken alot sometimes

runes basically help her with nuking people to death and being able to repeat the process with the mana regen

Just built these like a mage except a few touch ups on offense and the heal skill point

You can choose which crystal you want first in the start of the game but all these items give her alot of mana and alot of AP so she can do her work.
(if you want to switch the order around a bit too thats fine it all works the same way)

-you should be able to finish the game up on archangels staff but haunting guise helps for an extra boost in health and AP.

-frostbite and her ult is going to be her main health reducers so get these whenver you can pretty much
-the others are kinda there to prevent the enemy from fleeing with the ice wall and to finish them off with flash frost if they get far away.

Heal helps with the low health in early game
clarity keeps her in the lane for sooo long as well as her teammates