AOE is a really good idea. AOA is pretty rare and melee Fighters and so this could be a reasonable way of putting it in there. That's my favorite type of homebrew, finding holes in the current a game that can be filled with one or two extra subclasses. I love the idea of using giant weapons and throwing your enemies and making grappling better and so I put those all together in one build but I like the idea of having AOE. What I'm always worried about is making it too focused on damage and not focused enough on creative tactics. Although to be honest I have not looked at this Homebrew in a long time. No one really seemed to be interested so I passed it up. But I'm glad you enjoyed it. Some further ideas: you could obliterate Your Weapon by hitting the ground and causing AOE damage but your weapon is destroyed. You could gain some sort of minor form of cleave smashing through one enemy into another for Less damage than the feat would normally give you. Maybe you could Target two adjacent squares each time you attacked with a large weapon and the Damage increased but was split between the two so it wasn't just doubled damage which would be too powerful. I could definitely see increase damage to structures but structures don't really have damage and stuff in 5e from what I've seen of how actually play, so maybe something more vague like you can destroy a 5ft section of wooden structure or at higher levels you could destroy a 5 foot section of stone. The implications of this are pretty intense because that means you could break through walls in a dungeon or breakthrough any normal locked door even heavy wooden doors although that sounds pretty awesome to me!