Stukje over The Chalice of Light.
"
Eris Morn and her team went down into Crota's Netherworld to destroy him (they did
not jump into the Hellmouth, they went in by way of the Temple of Crota, we took a shortcut). But instead, the Hive took advantage of their approach to siphon their Light. This Light, presumably, was gathered and placed into a ritualistic (we all know the Hive love rituals!) "cup", and made ready for Crota to consume upon his return. This is why we find it in his chamber, all ready upon its pedestal.
For some reason, however, I guess the Light was insufficient to wake Crota on its own, possibly because Eris Morn managed to escape with a tiny bit of hers that he would have needed to return. And so, the Chalice of Light just sat there waiting to be used.
When we came in and crashed the party, we found it there, and upon summoning Crota ourselves, we discovered we could make use of it. Although Crota's presence was siphoning our own Light and crippling us (no health regen), we were able to snatch the Chalice of Light and use the dying Light of Eris Morn's dead compatriots (Eriana, Omar, Sai, Vell, and Toland) to bolster our own, allowing us to overpower Crota's Light siphon."
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