How do you change the properties of certain items?

I’m making a small romhack (one chapter) where i’m struggling to do two main things. Firstly, how do you change the damage that Mines do?
And secondly, how do you change the stat buffs given by the pure waters? a stat buff that wears out is just what i need, but i can’t use res for it.
Any help with these would be appreciated! :3.

Hi. Welcome to FEUniverse!

For the mine damage, [FE7] Mine item mechanics should probably help.

I’m not sure about the pure water, and it might have to do with changing the move item effect, but there might be a few hints here FE7 Pure Water boost.

the link for the mine mentions editing code at " 0x034378", but what does that mean? sorry, I’m new at coding, if you could help explain i’d appreciate it

A ROM is really just a big list of hex bytes that encodes all of the data and code. What the instruction means is to open up the ROM in a hex editor (FEBuilder has one inbuilt into it), jump to address 0x34378, where the amount of damage mines do is stored, and change the byte there from 0A (10) to whatever damage you want the mine to do.

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Ah, I see! thank you!

quick thing, when i jump to 0x034378, it highlights a bite saying 20, is that the one i need to edit?

Strange. I checked it and it was 0A. Is this US FE7?

oh, no, i’m trying to mod the mine applications of fe8, sorry for confusion

I don’t know much about that. You might want to search the feuniverse page of the mine patch or drop a message in the discord. I’m sorry I can’t be too helpful, as Im not really an expert. Thanks

ah, that’s fine. thanks for trying to help though