Heya!
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Don't get me started on Larian's Fly.....
Don't worry... in 5e Fly works like you'd imagine it should... do worry, however, because Larian's game engine is actually two dimensions, and operates on layers, and has since the D:OS2 days (for example, if you throw a fireball at three goblins on a set of stairs, and you aim it at the middle one, the middle one will get hit, but the one above it and the one below it will not, despite being only 5 feet away... because they are on different levels and the spell is actually a 2-dimensional circle, not a sphere).... they cannot have creatures in the air, because they must exist on a ground point at all times. So all flying is just fancy jumping, and it's completely dumb and ridiculous.
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Are you sure about this dimension design? It's not my experience. For example, in my current playthough as a Rogue, when I was temporarily indisposed during the fight on the boats towards Grymforge (two missed attacks + shove = death), Gale had to do a bit more than shooting his crossbow. His fireball hit all the dwarfs on the other ship, wether being on the elavated platform or down on the deck. Somewhat earlier he also hit all Giths wether on the ground or on the boulder nearby. Is that a different design than stairs? I never tried a fireball on stairs.
Generally I think it does not make sense to bring non-5e DnD rules into the discussion. It's difficult enough to deal with the changes of 5e by homebrew alone, where even I as a non-DnD player am partly upset by Larian's policy.
