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**Kyle700**:

I know that Annie and Soraka don't quite mix together with runes, but I'm lazy about them, so either will do.

Is armor pen or Crit dmg/chance better to get as a general physical charictar? I play Tristana mainly, and I buy a Phantom Dancer ASAP, so I'm thinking Crit chance or crit dmg.

Is ap per level no good for casters then, or is Magic pen just better in general for casters?

The choice between Crit Damage and Crit chance depends on the character. On Ashe, Tryndamere, and Gangplank, Crit damage is generally superior as they already get a ton of crits. On someone like Tristiana, crit chance is probably better.

AP per level is no good on damaging casters, Magic Pen is straight-up better. Someone elsewhere did the calc when they changed Sorc Shoes.

"Let's say you're using Annie's incinerate. At level 5 (rank 3), it's 170 damage with .6 scaling. If they have 30 magic resistance, and you had the OLD sorc boots, it would be (170+(33*.6))*.77 to get your damage, or 146.15 damage on your disintegrate. With new sorc boots, it would be 170 * .909, or 154.5 damage. You gain 8 damage. And that's early game.

Then, once you get your very first ability power item, you start gaining better benefits. The moment you pick up amplifying tome, this happens: taking rank 4 of disintegrate, it's (215+((33+20)*.6))*.77 or 190 damage vs (215+(20*.6))*.909 or 206.3 damage.

They are now 100% better than old Sorc boots."

So even a slightly lower amount of MPen is better than AP. This is for the same reason that Crit Chance/Damage are better than straight damage on Physicals: you're increasing the percentage of your damage, making it very powerful for the whole game. AP will only ever give you flat damage per point, and depending on your ratio it's not even a whole point of damage per point of AP. Every point of MPen reduces the amount of damage you need to do to a character to kill them, so the higher their HP gets, the more effective it is.