Advice for killing a tank with high Hp as a mage
I need advice on how to kill a tank as a mage (specific items i should get)
I need advice on how to kill a tank as a mage (specific items i should get)

are all good champions for taking down a tank as a mage, but if you're talking about any old mage and just want beneficial itemization, go for


Depends on the mage. Mages are a VERY diverse lot and not all of them deal with tanks well. Champs that handle tanks pretty well are
,
,
,
,
,
. True damage, % damage and damage over time skills are what you want for tanks. DoTs work well with
to burn away tanks health. Burst mages however only handle tanks well when they're very ahead and the tanks do not yet have a ton of defense against them.
If you're up against a burly, tanky team.... grab
or
. Probably the best tank-killing mages in the game. Brand is more useful in teamfights and Malz can 1v1 pretty much anyone foolish enough to get in his range unless he's behind.
is a close third place due to his true damage and the fact that his usual build focuses on M. Pen over AP to carve through the tanks MR.
is all I can offer. I hope people can give more.
Thank you for the feedback guys. ( If only i did not unlock orianna instead of Malzahar :[) I think i have tried those items before but what do i do when they have way too much health to kill? I must stink then... ;;
About if they have lots of health:
+
can REALLY burn through health due to the Slow on Rylai's giving Liandry's its full effect every tick which is normally 2% of current health per second. Its doubled against movement impaired targets, which makes its 2% of current health become 4% of current health.
Other items that can help those two go crazy are:
More flat/percent magic penetration helps a lot. With that item combo.
is actually a good Health Tank killer since his Null Zone deals Magic Damage Per Second: 4 / 5 / 6 / 7 / 8% (+ 1% per 100 AP) of target's maximum health and if you get them will his full rotation it can just melt them since you will end up having 3 high damage dealing DoT spells on them. Null Zone, Malefic Visions (Magic Damage Per Half Second: 10 / 17.5 / 25 / 32.5 / 40 (+ 10% AP)), and Nether Grasp (Magic Damage Per Half Second: 50 / 80 / 110 (+ 26% AP)).
I got the info from League of Legends Wikia.