D&D 5E Homebrewing Weapons guide - Help with Heavy Property wanted!

[Hillsy7]

The greatclub is 2 handed but not heavy.....now granted its not a great example, and I've eliminted outiliers such as the trident and handaxe from my final calcs....but it was the weapin that got me thinking about heavy as a property in its own right....which then lead onto 2 handed light weapons, or how heavy finesse weapons might work. It feels like there's a reason its there.....other than one presumes the two handed vessel for the shelleigh cantrip staying available to halflings.....

But mostly it feels like, thematically and conceptually, you're shutting the door on oversized weapons designed for one hand, and I wanted to keep options open as much as possible. Cos, yeah, I want my dwarf cleric to have the option of a short handled warhammer thats the size of a small car.....

So yes, certainly rolling the 2 in to the same thing would work, but right now I'm thinking that's more of a last resort.....surely mechanically there's other avenues....say for instance they are incompatable with TWF.....or maybe incompatable with duelist or something.....?

 

[Hillsy7]

You know what – I think I’ve only gone and cracked it!

Heavy: Due to its unwieldly size, a heavy weapon is not something used without skill and planning. While wielding a Heavy Weapon in One Hand, you cannot make Opportunity Attacks.

This has the benefit of not breaking the current rules (Two-handed heavy weapons work EXACTLY the same), but brings in the Heavy property into one handed weapons. At a cost. Wielding a heavy weapon one handed does give you extra damage, but you are in no way defensive – you’re too slow to react essentially. Meanwhile the monsters just sprint past and squish the squishies.

So what do people think of that? How much does it break the game to have the equivalent to a non-OA 2-handed Fighter, but with a lower dice weapon, but +2 AC?