Tier 3 CoO rotates weekly. I believe this week is Kagoor, wizard with the giant ogre. Next week will be Thalnok, crota fight. Ad the week after will be Balwur, kill acolytes then unload on the wizard.
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Is there a way to track the rotation?
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Destiny Reddit has a really handy weekly reset thread that refreshes every tuesday
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I usually check every tuesday by doing a google search, vg247.com details it all, nightfall, raid challenge, PoE and CoO.
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Other than taking a look or asking around, I don't know of one.