Black HiSec Key

A Black HiSec key is the Black Market-exclusive version of a Gray HiSec Key, required for opening Black HiSec Cases.

Price
The Black HiSec Key costs:


 * 900 NX - 1 Key


 * 6,400 NX - 7 Keys


 * 11,900 NX - 15 keys

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Trivia

 * Black HiSec Keys are practically the #1 most gift-wished items in the game, aside from Permanant items.