Corrupted Area Spawns

Strange Sinkhole in Fetid Pool (Merciless) too

Walled-off ducts spawned in The Market Sewers cruel. Boss was Cava, Artist of Pain. It looked like Spinecrack from Lunaris 3. It used lightning strike and the storm herald lightning storm.

I don't remember what the zone was called, but I saw one in The Coast that had the new Blinding enemy boss. He uses the charge-blind attack, Arc, and swings tentacles in melee.

Restricted Gallery

Found a stairway shaped entrance in The Library (merc)

Boss is named Ch'aska, a Sniper who uses Rain of Arrows.

Secret Laboratory on Chamber of Sins 1. Boss: Atziri's Pride, miscreation with Artic armour, lighting warp and Unrighteous Fire. Now i know why did they nerf it. He's really fast.

Sealed Corridors found twice in Sceptre of God (lower, both times in second floor). Boss is Wiraq the Impaler. IDK what monster is, but it looks like Piety when she's on fire form. Not very difficult.

Additional places for areas already described:

Covered-up Hollow - Fellshrine (Normal);

Neglected Cellar - The Marketplace (Normal);

Strange Sinkhole - The Twilight Strand (Cruel).

Found another location for Walled-off Ducts inside The Sewer Waterway - Act 3 Normal. Entrance was on a wall - looked like a sewer grate was lifted off the ground. Boss was Cava, Artist of Pain.

I've had the following that are not on the list yet:-

Covered-up hollow in Caverns 2 (normal)

Secret Laboratory in Chamber of Sins 1 (normal) - this was the first corrupted area I found, and from what I remember of it the boss had flicker strike, because everytime I moved away to give myself room to cast, he flickered back at me

Just been playing a new character , got one on the Coast and one in upper prison on normal so far . Fecker in upper prison fired arrows like Piety's cold form , but with bleed , bled out in like 2 secs :P

Covered up hollow - Fellshrine normal .