Guaranteed Style Chests can only drop cosmetics which are IN the game, or that can drop from the regular Style Chests. We periodically remove cosmetics from the game and put them in the vault, making them unavailable. This information is published in our patch notes. Guaranteed Style Chests DO NOT DROP cosmetics that are in the vault, even if you don’t own them. If you have everything that is currently available in the game, you will receive Honor Tokens from the Guaranteed Style Chests. Use the, "In Style Chests" option in your cosmetics drop-down menu to see what you could possibly get from Guaranteed Style Chests.
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Portal Quest GUIDE