The last darkin might be in...
No it’s not morgananand Kayle, undoubtedly, for the factor of lore maybe but for the factor of current lore on them no. The last darkin can be in 3 places. Not b/c they are parallel its b/c they are of from Targon and sent to other places. It’s fair to say Zoe is smart enough to spread the darkin off from shurima, so the 3 places left that are not so civilized yet,, are freljord, the shadow isles and bilgewater.
My reasons:
The Shadow isles have so much power to resurrect the dead they can resurrect a darkin,
Freljord: is still vast and by many others the frozen watchers are unfreezing, if the darkin were trapped so long and if the watcher are unfreezing that means any farming frozen can aswell
bilgewater: the seasons of bilgewater have became malevolent. It’s possible Zoe could have sent a trapped darkin there into the sea, for the factors ancient magic is in bilgewater of resurrection and the void spawns in the oceans.