Can anyone confirm if you need to be the one to activate a Tier 2/3 CoO encounter to receive a calcified fragment as a reward? Also how can you get stolen (tier 2) runes and antiquated (tier 3/legendary) runes?
Basically I'm starting to grind for fragments and some of them come from CoO
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Not sure about the frags. You get a stolen rune from completing 3 tier 1 CoO (on your ruin). They also drop occasionally in patrol on the Dreadnaught. You get an antiquated ruin from completing 3 tier 2 CoO (on your ruin). Not sure if they drop anywhere.