Rare Drop Rates

As per previously the roll which determines whether or not a crate gives an rare is the same roll which determines whether or not a crate gives a legendary. Crates have a fixed number of cards so the rare rate will effectively eat normal cards. Crates which give rares by default will gain an additional rare if this rare rate is rolled. Also worth special note is arena 7 bronze crates, with a lower rare probability than arena 6 bronze crates and arena 8,9 bronze crates give guaranteed rares. The potential for a rare vacuum in arena 7 is probably meant to offset the additional request capability arena 7 has over arena 6.

Epic Drop Rates

• - The roll which determines whether or not a crate gives an epic is the same roll which determines whether or not a crate gives a legendary.
  
• - Crates have a fixed number of cards so the epic rate will effectively eat a card from a lower rarity to give the epic (preferably rares but will eat normals if no rares are present in the box by default).
  
• - Crates which give epics by default will gain an additional epic if this epic rate is rolled. (I.E. if you get an arena 9 superior crate with 25 epics in it (instead of the default 24) that additional epic effectively ate your chance of a legendary and you will find that you are one rare short of the expected number.)
  
• - This additional epic is normally rolled into one of the existing epic groupings (so 12 and 12 becomes 12 and 13) but the creation of a new group is possible (so 12 and 12 becomes 8,8 and 9)."
  

- Elk (Librarian)

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Normal Drop Rates

And for completion’s sake the normal “eats” rate, despite the fact that as mentioned previously for crates that only give normal by default this rate is seemingly buggy. You will notice that adding legendary, epic, rare and normal for any one crate will not add up to 100%. This remaining “empty” % is the chance of the crate appearing as described in game.

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