Is it possible to stack effects or have prerequisites for stat?

remotemaster

For the server I'm making I want modular armor and weapons. Which also means heavy and light weapons and armor.

I want to give the heavy weapons and heavy armor a speed debuff, which is easy enough on its own, but I was wondering how can i stack the slowness? For instance holding a heavy weapon gives slowness 1, equipping heavy armor on top of that would get rid of slowness 1 and make it slowness 2, and unequip does the opposite.
How can I make something like that?

As for the prerequisites, I also want lances. Lances being "vehicle weaponry", should hardly be able to be used on ground, and only do real damage when riding a horse, but I cant figure out how to make something like this happen.

Anyone have any ideas? I'd appreciate all replies that might give me an insight on how i might be able to do such things.

Verum

To the best of my knowledge, you would need a third party plugin for something this specific. I know there are a bunch which do "weighted" armour which can be found on Spigot. As for the vehicle weaponry, I am not familiar with any way to do this currently. Perhaps anyone else reading will know more.

remotemaster

Thanks, I think I've found one of the plugins on spigot you were talking about. It adds inventory weight and is able to add weight to anything in an inventory using lore or a specific tag. This might work great for weighted armor / weaponry, although I'm debating wether or not to add additional slowness buff to my heavy weaponry, but that's a matter of balancing