Talk:Muramana/@comment-108.172.56.105-20121211021505/@comment-5266525-20121212002237

^ Kog'Maw can't proc the item on his ult because it's an AoE.

And you DON'T have to lane with a Manamune. Unlike Archangels it doesn't stack any faster if you upgrade it early (well, besides also stacking on autoattacks but who gives a crap about that), so you can hold off spending the gold on it until the Tear is fully charged. And it's only 700 gold, so it's not going to cripple your early game overmuch.

And it gives WAY more damage - some basic mathematics will tell you that. Your mana pool is irrelevant here, but just calculating with your base mana and the items' mana for example's sake:

Bonus Muramana damage on ult = 2150 * 0.03 = ~65 damage per orb

Bonus Seraph's damage on ult = 2150 * 0.03 * 0.2 = ~19 damage per orb

The damage from Seraph's has an extra factor of 0.2 because of the AP ratio. Even factoring in the base AP and Rabadons, the damage Seraph's gives you is only about 49 points per orb. And to get that amount of extra damage with just raw AP you'd need over 320 extra, of which no single item will give you.

So it's just a question of whether it's worth the loss of damage on your other spells, really.