Beta Rockwell (Aberration)

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Official wiki:

Rockwell

Rockwell becomes vulnerable once all tentacles are destroyed. After a short while he will sink into the Element pool he sits in and regrow the tentacles. Reapers and Nameless spawn as minions.

Summon

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Engrams

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Guaranteed Loot

This loot will always drop. Note that some items are harvested on kill and others go straight to your inventory.

Beta Aberrant Implant

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Possible Loot

This is the full loot table. You will only get a small selection and some may be blueprints.

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