0650: #64 solved, and Lorick #65 I'm a mystery under the blue

Lorick #64:

I'm a mystery under the blue

the key to my lock known to few

highlanders roam

near my watery home

if a monster - that judgement's on you!

But first, we solve #65 - here it is one last time:

It's Yahweh or the highway I guess

A prophet delivers or else!

I refused and was eaten;

but repented... I'm beaten!

I rue my grim warning's success!