Tearblaster is a secret hidden weapon in Horizon Zero Dawn. Here's how to get it:
1) Complete Errand "Hunting for the Lodge". It triggers by getting 3 Half Sun Marks at Hunting Ground Trials.
2) Complete follow-up side quest "Hunter's Blind". It triggers automatically after Hunting for the Lodge, mark it in your quest log.
3) After Hunter's Blind you get a Tearblaster treasure box as a mission reward.
4) Go to inventory - treasure boxes - tearblaster weapon box - open
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