That could definitely be a little nod to Oddworld, though it seems odd that they'd stick it on a bulky, warmongering species like the krogan, which is basically the opposite of mudokon culture. Although I guess it could make sense since both races were pushed almost to extinction.
The holes do make it look super alienesque, but I don't see them serving any practical use, it'd be too easy to break bones with so little hide or muscle to protect them.
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