Are you referring to a tradable commodity among civilizations? or the shop?

If you mean a tradable commodity like iron, then I'm not sure how to go about doing that. I'd have to dig deep to see how to get a resource to show up... never tried.

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Look into tweaking it in techs if you haven't. I know stuff like wargs etc. gets unlocked there when you reach a certain tech. 

Edit:

<GameModifier>
<ModType>Player</ModType>
<Attribute>UnlockDiplomacyWndAbility</Attribute>
<StrVal>Gold</StrVal>
</GameModifier>

Here is an example modifier for gold at trading. You might be able to put it elsewhere if you want to not tweak the tech xml's.

I'm trying to merge these two into one. 

<RadiusType>LINE_FORWARD</RadiusType>
<RadiusType>ADJACENT</RadiusType>

But I can't seem to do it, or I need to make a new RadiusType, and there is no template to work from afaik. Any suggestions how to proceed? I want Cleave and Impale merged into one, so it can hit up to 4 clumped up enemies. If there is some way to make 2 spells into one that could probably do the trick, but I don't know how to do that. 

The range is target range, so 1 = melee. Radius is obvious  

Adjacent = 2 next to target. More Radius should let you hit 5,7,9...  etc. in a row. Essentially a horizontal line in front of you.  

The <Radiustype> modifier seems to be limiters, if you remove it you get a fireballesque radius. The workaround I am using now is without limiter and just a pure 3x3 square effect radius. I tried putting these into gamemodifiers as well, but they stopped working completely then.

LINE_FORWARD LINE_BACKWARD and ADJACENT is all the radiustype values I've found, and I have no idea where they are created. Also, what the hell is the difference between forward and backward? They seem to be used randomly in the spells I looked through, but does essentially the same thing.

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Have anyone been able to get the <artdef> TintR 255 etc. stuff to work from the mod folder? I recently did a life magic book, but it still looks like attack default book that all the other magic books work from. 

Yes, it's a minor issue so I hoped not having to do too much work on it

Problem:

If I make a copy of CoreAbility.xml where I edit abilities, in game I see that both abilities apply to a unit - those from original CoreAbility.xml and from my edited file. Also I see both descriptions.

Example:

I try to make trait Strength give +3 Attack instead of +2. I create a new file traits.xml and put it in the Mods folder. There I find the trait Strength and instead of +2 I insert +3. I save the file, launch the game and in my heroe's screen see:

"Strength

+2 Attack

+3 Attack

Here goes original description

Here goes my edited description"

If I look through statistic, my hero receives total +5 Attack instead of +3 as desired.

Why so? What is the best way to edit abilities?

I want to keep it as a mod, so that to ensure that no patch or Steam will overwrite my changes and perhaps I will publish the mod if it will be interesting.

So the question remains the same - how to edit abilities for a mod?

Abilities are a bugger to remove modifiers from.  Adding them, easy... removing them not so.

This is essential reading before you try anything from the mod folder:

https://forums.elementalgame.com/434780/page/1/#3378469