Here is the story:
The collapse- Hive takes the moon!
A few centuries later- The last city launch an massive attack to retake the moon (involving several thousand guardians) but I fails and the city suffers the greatest loss ever making the moon a forbidden place!
A unknown time later- Eris and her fire team goes to the moon and tries to kill Crota as revenge for the thousands of guardians who fell, they almost succeed but the Hive manage to capture Crotas soul making it possible to resurrect Crota!
Present time- Eris -blam!-s you in the shower in the tower making you her bitch, so now you have to do a lot of shit because she's more alpha and she told you to!
The end
English
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So did the eris strike team kill him/banish him but not kill him? Obviously, someone had to do one of those or else why would the hive be "resurrecting his soul"...
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They killed his physical body but not his soul
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They killed his shadow there is no physical manifestation of crota in our world just a shadow of the being in crotas end you go to the hives world (loading seen when you teleport after thralls is to a hive netherrealm likey one of the lowest realms as crota was but a minor god and its in this realm that our fireteams are able to kill him
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So is this why they say the guardians failed to defeat him? It makes a little bit more sense when you pit it that way, but it sounds like they weren't able to best him, and that's why the moon was abandoned. If this is the case however, it makes me wonder... So they beat his shadow at great cost, then gave up after taking out the hive leader? Why? Wouldn't that just be saying, "well, those guardians died in vain."