Hunger of Hadar reads: “The Void creates a warp in the fabric of space, and the area is difficult terrain. Any creature that starts its turn in the area takes 2d6 cold damage. Any creature that ends its turn in the area must succeed on a dexterity saving throw or take 2d6 acid as milky, other, otherworldly tentacles rub against it.”
Does that mean if two different warlocks drop HoHs simultaneously on the same area, creatures within those tentacles suffer 4d6 cold and possibly 4d6 acid and more significantly 1/4 speed movement? Role playing-wise there are double the number of tentacles. combat-wise AoE spells of different types/schools stack or neutralize each other, so why wouldn’t two Hunger of Hadars double the effects?