This is based of @lordapollyon1’s list and a reply I posted in his thread. But since his list here only details on Bronze Sea and I havent seen any for Nimbus. I decided to make my own.
Nimbus Sea Islands Status (will be updated):
Forest of Masts - Low-Moderate Atlantean presence due to it already being uninhabited and a wasteland of ships. Capt Maria and her crew would likely have to fend off some lesser Atlanteans that come here.
Claw Island - Low Atlantean presence because its small and uninhabited.
Shale Reef - Low Atlantean presence thanks to it’s remoteness and being uninhabited. Though some Atlanteans might drift here and have to face against the Heroes/Bounties that spawn here.
Drakos Arch - Low Atlantean presence for the same reason as Shale Reef.
Port Mistral - High Atlantean presence assuming it wasnt destroyed by Keraxe. The town would be overrun and destroyed by invading Atlanteans with barely any resistance to defend.
Sameria - High Atlantean presence. Parts of the island would be destroyed but I think that the military forces of Sameria would manage to fend them off better than Ravenna and thus not get totally overrun. I can see the Generals and Nilah escorting the people to safety somewhere on the island and surviving. But if they run out of supplies, their people are cooked.
Shieldguard - No Atlantean Presence. They have enough manpower, supplies and military force to survive and fend of even higher lvl Atlanteans and would likely do better than Silverhold as instead of a Commodore being the only strong NPC there, they have several Majors and a Rear Admiral who knows Gravity Magic.
Markinaos - Unknown. This is a weird case because it can go either way. Either the Assassins successfully fend off the Atlanteans from Dead Halls, or the Atlanteans become attracted to Chaos Energy from the Abyss of Charon and overrun the Assassins like Akursius. Another possibility is that the Banished King gets awakened and being possessed by Chaos, eradicates any Atlantean that stumbles across him. OR another possibility, the Atlanteans are repelled due to sensing the ‘pit’ that the player cant enter which is theorized that it leads to Hell.
Tidecliff Isle - Very Low Atlantean Presence. The whirlpools around the island would ward off most lesser Atlanteans. Providing a decently safe refuge for anyone who makes it. However the relatively baren land might prove a challenge for say growing food.
Skyhall - TBA
Vimir Sea List (TBA in Far Future)