What is the Void Staff in League of Legends?

Answer 1

Void Staff is an advanced item in League of Legends It is used to counter champions that stack magic resistance.

Note:

Combining Void Staff with Arcane Knowledge yields 40.2% magic penetration, rather than 43%, because percent magic penetration stacks multiplicatively.

The same is true for armor penetration with Weapon Expertise and Last Whisper.

The 35% magic penetration from Void Staff becomes more effective the more magic resist the enemy target has on them. Ranging from 30 magic resist to 200 magic resist, the magic penetration increases damage from 8% to 30%.

V1.0.0.152:

Magic penetration reduced to 35% from 40%.

Void Staff is now applied before flat magic penetration.

V1.0.0.142:

Coloring changed to blue from the glitch where in the shop it was red.

V1.0.0.74:

Recipe changed to Blasting Wand + Amplifying Tome + 1000g.

V1.0.0.61:

Passive ability is now Unique.

V1.0.0.52: Added

Mid tier ability power/mana Item: gives your spells 40% magic penetration.

League Of Legends Items Guide : elohell.net