Slayer Keys are gained upon slayer task completion at the following rates:
Easy Tasks: 50% Chance to receive 1 key.
Hard tasks: 100% Chance for 1 Key, 50% Chance for 2 keys, and 10% chance for 3 keys
Boss Tasks: 100% Chance for three keys, 75% chance for 6 keys, 30% chance for 9 Keys, and 10% chance for 12 keys.
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The Slayer key (+) is an upgraded version of the Slayer Key. It may be used on the Slayer chest (+) located inside of the Soul Room at home.
The key is a byproduct of combining 250 Granite Dust. Granite Dust is always dropped by Grotesque Guardians.
It can also be acquired by combining 100 normal Slayer Keys or from Slayer Prestige 6+ Slayer Global Drops.