Shinjuka wrote:
Additionally I believe the +30% stacks, so if you had 200AP with a Rabadon's, you would first jump to 260AP then 278AP then 283.4AP, then 285.02 and effectively stop there (the 30% keeps on going but the number eventually goes to 0!)
If the math was confusing, basically the 30% stacks on itself, so the 60 you gain from the 30% will have its own 30% applied to it also.
Nope, archmage and deathcap passive are additive.
You just multiply your total AP by 1.3, or 1.35 if you have

Tri lane for life.
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The thing you describe is when you got the Archmage mastery. The Ap given by Deathcap will be taken account for the Archmage bonus you get. The bouns will effect the Deathcap passiv again and so on to the point where 5% of the given Ap by Rabadons are to less to make 1 Ap out of it.
Nope.