This is part of the problem with the secret squirrel society. It’s almost deliberately vague. You literally have no idea what to do at certain times, forum notwithstanding…
Vault Keys have considerable intrinsical value in the game, wasting using them is extremely counter productive.
Why can’t it be as clear as this?
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Heart of Rage is a unique drop from the vault only. It will be in the vault from this date insert date or day campaign ends. It will remain in the vault drop table during all other campaigns.
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Heart of Rage can only be obtained by vault keys and the percentage chance of it dropping is insert value as it is legendary rarity it insert % chance will drop less or as frequently than/as (delete as appropriate as I’m still guessing, so clarification is required) other card rarities found in the vault, when using a vault key.
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There are no current plans to release Heart of Rage in any other way (subject to future change at our discretion).
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Furthermore the purpose of Heart of Rage is that it is a consumable ingredient. It can be used with 8 power orbs to create Enraged Kurandara, a boss version mythic (or whatever it is called). Players do not have to own Kurandara to craft the enraged version. Players that have obtained Kurandara, you will still require one element of the crafting recipe - 8 power orbs to create the enraged version, as you obtained the Heart of Rage as part of your elite purchase.
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Heart of Rage is consumed as part of the recipe to craft Enraged Kurandara, and for those players who like to have a complete collection, you will need to obtain a further copy by vault key chance, using vault keys and obtaining a further copy by beating Cedric and his colleagues in the vault.
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We have no plans to lower the cost of power orbs to upgrade a mythic to a mythic boss, and the campaign starting w/c 7th October 2020 will include a mythic and various components as part of the campaign. At the end of the campaign, players that have purchased passes will obtain the mythic rarity troop and all of the components, except for 8 power orbs. 8 power orbs will always be required to be used to craft the boss version of the mythic, using components purchased as part of the pass system.
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Players who choose free pass, will not be able to get the base mythic, but if they have 8 power orbs, will have 1 of 2 ingredients to do so. The other ingredient (s) insert whatever is only available by insert ‘tell us how we can get it’ . The other ingredient insert whatever will be available on insert date by the insert method as explained.
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All mythics released as part of a campaign will require 8 power orbs to uprate, to all participants. No player needs to complete any campaign, as any boss mythic will be available to craft after the event end, provided you obtain the ingredients (as we have explained) and use 8 power orbs.
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Boss mythics will always be available to craft at any time, using the requisite ingredients.
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Kurandara will be in the soulforge w/c 21/10/2020 and can be crafted using the standard crafting recipes as per all none boss mythics - 4000 diamonds, 20,000 souls and 10 Celestial Traitstones. This will always be the case (subject to our discretion, but with adequate notice)
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Each campaign base mythic will enter soulforge on the Monday reset, 4 weeks after the campaign ends, and will be confirmed with the actual date at the commencement of each campaign.
Simple really.
FWIW I don’t think it is available in the vault right now, but could be wrong…