Last weeks nightfall and weekly heroic strike was on Venus and there are at least 5 hydras during the strike and yet I did not receive credit for one kill of them. Before and after doing both strikes 3 times (once with each of my 3 characters) my kill count on Hydras was 87 and it remained the same. I'm a grimore nerd ha ha, so please fix this issue.
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Check this post for information on grimoire and it has some very helpful guides too. https://www.bungie.net/en/Forum/Post/101097919/0/0
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Only ones with a red health bar. Majors (ones with gold health) don't count.
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Major hydras (yellow bar) don't count towards the grimoire total for some reason. Only the regular ones do.
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Yellow health enemies don't count towards Grimoire. Only red health enemies do.