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Full: For 30 seconds, Echo is replaced with the next skill you use. Echo acts as this skill for 30 seconds.
Concise: (30 seconds.) Echo becomes the next skill you use (30 seconds).
Signet of Capture:
Note: If the boss has echoed another skill before dying, its Echo will be replaced with the other skill. If you want to capture Echo but it does not show up in the capture skill list, wait for 30 seconds and use Signet of Capture again.