freyar
Extradimensional Explorer
Then let's add in some kind of repulsion by silver instead of DR. Kind of like an allergy. 
Improved Grab is fine, though there's some implied throwing in the original text. Either way is ok.
I'd rather either do the AC penalty or the water-based creature vulnerability but not both. The AC penalty is something I'd leave for flavor just to state that they won't leave their home environments.

Improved Grab is fine, though there's some implied throwing in the original text. Either way is ok.
I'd rather either do the AC penalty or the water-based creature vulnerability but not both. The AC penalty is something I'd leave for flavor just to state that they won't leave their home environments.