Reason I think it is a high priority & will be the next content released is:
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SGG stated it would be coming in the 2020 sneak peak
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There have been suggestions about it being a priority in other Staff posts
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Super secret communications from sources burried deep in the organisation
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An UNFINISHED version of the Hero Academy was accidentally published in the last version of Beta Testing. It was immediately removed when SGG realised BUT it was there & it looks promising.
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There has been a recent upsurge in sacrifices made to the Hero Academy gods (see here: Appeasing the SGG Hero Academy Gods)