It's really not up there with rocket science levels of physics though, and the same physics actually do apply in game. If a character is behind a barrel, and you're on an even plane, +2 AC for the target. You could still hit them, but it's going to be harder. If you're elevated above the height of the barrel, no more cover advantage, because you can see them just like you could if they weren't and you were on a level plane. You see, when I'm talking advantage here, I'm talking pure visibility mechanics. The game rules apply, but I'm not even concerned with them, I mean, the idea of the thread is to actually use the game's rules, right? I just looked at the more practical application. In the spirit of the thread, this should be celebrated, not used as an example of something bad, right?[/quote]
If you have line of sight .. they do too - no advantage
Shooting up 4 steps is no different than shooting down 4 steps.
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I don't write the rules, I just have to play by them. If it's in the 5e rulebooks, and it's implemented in game, then what you or I think doesn't matter. As we can see from the OP's subsequent post, it's less to do with the rules, and more to do with something else entirely, that has nothing to do with the rules.
So far, if they refuse to make it a DnD game then they should not be using the name, world, or lore. The game plays as divinity, and is divinity. Has nothing to do with DnD and definitly nothing to do with the forgotten realms.
Everything they implement has to be approved by WotC. You know, those pesky people that own the IP? If they thought it was too far outside the realm of their rules, it's not in game, you can bet on that. Whether WotC is handling the IP correctly is another debate, they lost me at 4e, never looked back, table top wise anyway, but as it stands right now, they own it, and they approve it. You should check out the Dragonlance author's lawsuit if you want to see just how much in the mix they get with creative stuff in their IPs. I must admit, I was a bit more than just surprised.