The % mana bonus AP and AD of the unique passive Awe do not negate eachother.

If you buy both of these items, the only gains that do not stack are the lesser mana refund and the lesser mana gain on ability cast. You will only gain 25% of the mana spent on abilities and the more powerful Tear effect will apply and be maxed out first. The AD and AP from the two Awe passives are both in effect at the same time and do not cancel each other out.
In other words a mana champion will earn 5 AD, 15 damage from Shock's passive and roughly 160 AP (which with its Tear effect scales up to 20 AD, 60 damage from Shock's passive and ~183 AP) by the time they buy (and can afford)
after having earned 750 mana for
and purchasing a
.
The more you know. Mana carry privileges!
build that revolves around earning 750 mana for
by 30. I've been rushing
but I'm starting to think that's really dangerous in this meta and that