Destiny where + how to use charged agonach rune and rewards the taken king gameplay

Destiny how to get to where you use the agonach rune and the rewards after killing the boss ( click here to see my video on the hidden sword attack https://youtu.be/mVpmh8n7fEQ ) ( click here for video how to use reciprocal rare and antiquated runes https://youtu.be/xa1lEU_okeE ) Hope you enjoyed thanks for watching