[Nightfall]

As an interesting pretender option for a variant of this strategy, possible mainly because Oceania gets natural Air/Water mages, you could also go for a Dormant Dom9 N5D3?5 Ancient Kraken without tanking your scales badly.

There are multiple good options for the third path depending on which way you want to go, I think that's more down to personal preference.

I know it's unusual to build a dormant SC, but in this case it's job is to allow you to expand onto land and be a passive threat that can hold what you take while he does lab work. It works because you can have a fish amulet ready and waiting when he wakes.